Develop Bugs

Bluetooth pairing issues

My issue today is that my bluetooth will not pair properly and remember its configurations. My initial pairing on my phone with my car's flexsmart X3 works perfect, however when I turn off my bluetooth on the phone or turn off my car and turn it back on the phone will still see the flexsmart and it will say it is paired but I get no sound. Upon further investigating I find that in the options setting that neither the call nor music tick box is checked. If I try to tick them it will think for a few seconds and then gray out and do nothing again.
I never had a problem with my note 2 or my temp replacement evo 3d remembering these settings. All I would do with those phones was pair it once and then any time I hopped in the car I would just turn onm,y phone's bluetooth and go. Now with my note 4 I have to unpair and repair the devices each and every time which is a huge pain.
I have read a little bit that this is due to samsung note 4 using a newer bluetooth standard than its predecessors. Is there anyway to circumvent this issue by maybe rolling back the bluetooth drivers or something? I even thought about creating a tasker profile to help with this but still I would have to physically press the search button on the flexsmart eachtime.
Any and all suggestions would be great. Also right now I am on rooted stock 5.0.1
PS: I will try and post some photos to help when I get the chance to get to my car.

I've been start for a solution to this since the phone came out as well. I have the same Bluetooth issues with my phone in my car. Nothing more annoying than having to turn Bluetooth on and off for 10-15 minutes of your drive before you can use the damn thing. Oh wait, more annoying would be when it's been working for a solid 45 minutes or so and then suddenly, with no warning, the Bluetooth connection ends for no reason and your cars stereo comes on instead of what you were streaming only the volume on the cars radio is far louder and it scares the ever living crap out of you

flyhighx said:
I've been start for a solution to this since the phone came out as well. I have the same Bluetooth issues with my phone in my car. Nothing more annoying than having to turn Bluetooth on and off for 10-15 minutes of your drive before you can use the damn thing. Oh wait, more annoying would be when it's been working for a solid 45 minutes or so and then suddenly, with no warning, the Bluetooth connection ends for no reason and your cars stereo comes on instead of what you were streaming only the volume on the cars radio is far louder and it scares the ever living crap out of you
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Odd....I dont seem to have that issue. Once I have initially paired the bluetooth it will stay connected without any interruptions. Also pairing for me is really fast and only takes a minute or so. My problem is that instead of my phone remembering the current device settings that it is paired with, it will forget to associate it with calls and data after I turn the bluetooth off and then later back on even though the phone will still remember it is paired with the car bluetooth.
First world problems I know but it gets a tad annoying having to unpair and repair my phone each and everytime I hop in my car to go somewhere if I want to listen to my music.

In the car I don't get a lot of skipping. But when connected to my BT speakers audio does skip a lot and starts playing in ffw then disconnects completely. It's driving me nuts. I've tried all the usual trouble shooting also. No help. Wtf Samsung/Google

Bluetooth Car Sync Issue

Is anyone else having issues syncing to your car? Mine connects for 5 seconds and then flashes phone not detected on my phone screen and disconnects. I am running the deluxe standard model, not the special edition. I have checked the easy stuff like making sure Bluetooth is enabled and successful pairing. I can connect to Bluetooth speakers no problem. My Google music app also froze and could not be recovered by powering off or closing apps. I had to uninstall and reinstall. Let me know if anyone has had a similar issue and hire or if you fixed it.

I listen to music in my car via A2DP/BT Audio & have no issues with either listening, or controlling (fwd, rewind, etc...) music apps like VLC via the car controls.

no problem pairing with my car, mobile, music etc etc.

dktrwatson said:
Is anyone else having issues syncing to your car? Mine connects for 5 seconds and then flashes phone not detected on my phone screen and disconnects. I am running the deluxe standard model, not the special edition. I have checked the easy stuff like making sure Bluetooth is enabled and successful pairing. I can connect to Bluetooth speakers no problem. My Google music app also froze and could not be recovered by powering off or closing apps. I had to uninstall and reinstall. Let me know if anyone has had a similar issue and hire or if you fixed it.
Click to expand...
Click to collapse
2 ppl confirmed properly working BT;
1: make sure you're on the latest firmware
2: close any other apps which might be using BT (do you have other BT devices on you? They might be conflicting)
3: make sure your music app is whitelisted in battery optimization options
4: try other music apps, like VLC
5: choose balanced power management
6: factory reset & try BT audio as the 1st thing after a fresh boot; this should help you isolate the issue.

Soetimes
dktrwatson said:
Is anyone else having issues syncing to your car? Mine connects for 5 seconds and then flashes phone not detected on my phone screen and disconnects. I am running the deluxe standard model, not the special edition. I have checked the easy stuff like making sure Bluetooth is enabled and successful pairing. I can connect to Bluetooth speakers no problem. My Google music app also froze and could not be recovered by powering off or closing apps. I had to uninstall and reinstall. Let me know if anyone has had a similar issue and hire or if you fixed it.
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Click to collapse
I have the same issue sometimes. My Honda Accord had no issues pairing to my Note 7, and connected to it perfectly every time. The car also initially paired quickly to the ZF3D, but when I get in the car I have to manually select the car in the Bluetooth menu. If I try waiting, it will either never connect, or flash like yours. connect for a second then lose connection.
either way, manually selecting it makes the phone keep its connection throughout the entire drive.
Hope it helps!
Nick

Nicksjohnson said:
I have the same issue sometimes. My Honda Accord had no issues pairing to my Note 7, and connected to it perfectly every time. The car also initially paired quickly to the ZF3D, but when I get in the car I have to manually select the car in the Bluetooth menu. If I try waiting, it will either never connect, or flash like yours. connect for a second then lose connection.
either way, manually selecting it makes the phone keep its connection throughout the entire drive.
Hope it helps!
Nick
Click to expand...
Click to collapse
Thanks all, I tried all of the tips above to no effect. Manually selecting still drops within 5 seconds. Tonight I will try it in a different car to rule out a compatibility issue with mine. I aIso downloaded VLC and made sure everything was white listed. Phone reset had the same issue with no apps installed. My old Note 4 pairs just fine and stays connected. The Buick Bluetooth (2012) system isn't the most up to date either and has limited capability (phone only, no music) so it may be a car issue.
Thanks,
Eric

dktrwatson said:
Thanks all, I tried all of the tips above to no effect. Manually selecting still drops within 5 seconds. Tonight I will try it in a different car to rule out a compatibility issue with mine. I aIso downloaded VLC and made sure everything was white listed. Phone reset had the same issue with no apps installed. My old Note 4 pairs just fine and stays connected. The Buick Bluetooth (2012) system isn't the most up to date either and has limited capability (phone only, no music) so it may be a car issue.
Thanks,
Eric
Click to expand...
Click to collapse
It is a car compatibility issue. It works fine in other cars apparently just not older Buicks. Thanks for the assistance everyone.
Eric

Was this issue ever solved? I have the same problem with my 2013 hyundai i30

sharlene.s said:
Was this issue ever solved? I have the same problem with my 2013 hyundai i30
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Click to collapse
I was never able to pair it with my vehicle even after a reset. It works fine with my other car, and it works fine with everything else I have tried.

dktrwatson said:
I was never able to pair it with my vehicle even after a reset. It works fine with my other car, and it works fine with everything else I have tried.
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Click to collapse
Thanks for the reply....that sucks... looks like that's the end of my zenfone 3 deluxe

Minor issue here but similar
dktrwatson said:
Is anyone else having issues syncing to your car? Mine connects for 5 seconds and then flashes phone not detected on my phone screen and disconnects. I am running the deluxe standard model, not the special edition. I have checked the easy stuff like making sure Bluetooth is enabled and successful pairing. I can connect to Bluetooth speakers no problem. My Google music app also froze and could not be recovered by powering off or closing apps. I had to uninstall and reinstall. Let me know if anyone has had a similar issue and hire or if you fixed it.
Click to expand...
Click to collapse
I am finding that auto connecting to BT in the car and on my Gear S3 is hit and miss, however i have had no issues when doing it manually, but it is a pain in the ass. hopefully ASUS will fix this when they release the nougat update!

My Zenfone 3 will pair with the car and a number comes up that I have to type into the phone but the keypad flashes up on the phone for 1 second and then disappears too quickly to enter it. I have tryed it about 10 times and always the same result. Anyone have any idears on how to fix it.

O update and bluetooth audio

So I had been on the beta version since it was released and participated a few times in the thread here: https://forum.xda-developers.com/pixel-xl/how-to/android-o-beta-issues-t3609335 and others were having the same issue.
The issue is no song/artist information being displayed on my touchscreen stereo, and I cannot use the stereo to pause/skip to the next track (I have to do it through my phone). Ive tried a local audio player, Google Music, and Pandora all to no avail. The deck is a Pioneer double-din AVH-P8400BH.
In my daily car, my phone bluetooth name appears and I can change song ect thru the deck. It is not a touchscreen and it probably 10 years old.
Ive gone into the bluetooth settings and have tried changing the AVRCP from 1.4 to 1.6 (neither work), and audio codec from default to enable optional (neither worked).
Anything else I should try out?
TIA

Please add your experiences to this website... they currently have over 100 replies of this issue and some other Bluetooth issues. https://productforums.google.com/fo...eDphsoOJ4;context-place=forum/phone-by-google

I had the same issue, but a simple unpair and forget from both devices then repair fixed my problem

marcjc said:
Please add your experiences to this website... they currently have over 100 replies of this issue and some other Bluetooth issues. https://productforums.google.com/fo...eDphsoOJ4;context-place=forum/phone-by-google
Click to expand...
Click to collapse
Ill throw in my comments, thanks for the link!
mjc2251 said:
I had the same issue, but a simple unpair and forget from both devices then repair fixed my problem
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Click to collapse
Ill have to give this a shot!

mine has awful streaming. It has so many skips...snags...audio blanks...whatever term you want to call it....its not "uninterrupted".
I was hoping google IMPROVED Bluetooth. I don't understand why they have this struggle to be honest. Its 2017....Bluetooth is not new technology.
Maybe they should stop expanding their department to provide data to the government to spy on private citizens using smart devices, and they would use those resources to fix bluetooth

Pioneer brand head units in particular I have seen Bluetooth streaming issues when paired to flagship model phones for years...even back as far as my LG G3. I got a Kenwood head unit instead, never had an issue.
As far a the Pixel XL and BT streaming...I have only had issues with dropouts zap sounds or pops, when i am out mowing my back property with my tractor...phone in pocket and BT headphones on. But my previous phones did this...most certainly due to the railroad nearby and high rise high voltage power lines and towers that are above me in that area.

speedingcheetah said:
Pioneer brand head units in particular I have seen Bluetooth streaming issues when paired to flagship model phones for years...even back as far as my LG G3. I got a Kenwood head unit instead, never had an issue.
As far a the Pixel XL and BT streaming...I have only had issues with dropouts zap sounds or pops, when i am out mowing my back property with my tractor...phone in pocket and BT headphones on. But my previous phones did this...most certainly due to the railroad nearby and high rise high voltage power lines and towers that are above me in that area.
Click to expand...
Click to collapse
Pioneer uses a cheaper bluetooth and never updates the firmware of the chips to fully support the available Bluetooth profiles even when they are developing their units and new profile updates are available. I have had a very long and annoying history with them to the point where I was in direct contact with their build team after all my complaining. That was back in 2012. Never used another of their products again. :good:

I have the same issue on my Chevy Colorado 2017. Everything works fine on Spotify on my Huawei Mate 9, and iPhone 7. It also worked fine on 7.1.2. Spotify works and music comes through but no info is displayed. I unpaired both things with no success. Frustraring.

I tried unpairing mine as well, no luck either

stupidchicken03 said:
I tried unpairing mine as well, no luck either
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Click to collapse
Have you tried unticking "media" in the profile hitting ok, going back in and ticking media again?

pcriz said:
Have you tried unticking "media" in the profile hitting ok, going back in and ticking media again?
Click to expand...
Click to collapse
I have not. Ill give it a shot today.

No idea if this problem is related or not but might be worth a check if you have time. First time I put Oreo on my phone it was fine. Then I screwed something up and just ADB flashed the image again. Everything was fine until I tried bluetooth a few days later. It wouldn't connect until ticking that media box many times. Then I flashed the image again and it worked fine again.

So I just got the 8.0 OTA (not on beta). I see in the dev options that it shows what BT codec it is using.
I have noticed that only the option "Bluetooth AVRCP Version:" is the only value that changin it does it stick. The other setting appear to be on auto and revert to auto depending on what device u pair supports.
My first test on my Kenwood KDC-BT762HD it paired fine and it said it was using AptX. Streamed for a few min fine. Then after I got back in the car and it auto paired, music started skipping every several seconds. I turned radio off then on to repair it and it started streaming fine again....but was using SBC according to Dev options.
When I changed AVRCP version to 1.6.....it connects and uses AptX fine. However, the radio display no longer displays the BT media metadata(title/artist), but the controls on the radio still work. I change to AVRCP ver 1.4 and that restores metadata, but then it uses SBC again. (using ver 1.5 results in SBC and no metadata).
I don't really care about the song info not being displayed on my radio....but definitely seems to be something fishy with BT in this new update.
EDIT Update: so now I am noticing it auto re-connecting and using SBC all the time now. WOnt use aptX unless i delete the device and re-pair it. then it works for a few reconnects, but then drops to sbc cagin.

Thanks for posting, I won't be updating. The Bluetooth has never been right and now seems to have regressed.
Sent from my SM-T280 using Tapatalk

i think i'm having slightly fewer drop outs with oreo than with nougat. my moto x pure on marshmallow was really bad.

FZ1Darren said:
i think i'm having slightly fewer drop outs with oreo than with nougat..
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Click to collapse
i agree and although i dont get the proper song listing on my car stereo it seems everything else is better. on nougat my BT headset i use for work all day (moto buds) would often stop connecting properly and i would make a call and have to select "phone" then "headset" again to get audio back on headset and om Oreo it happens less frequently

fletch33 said:
i agree and although i dont get the proper song listing on my car stereo it seems everything else is better. on nougat my BT headset i use for work all day (moto buds) would often stop connecting properly and i would make a call and have to select "phone" then "headset" again to get audio back on headset and om Oreo it happens less frequently
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Click to collapse
If you switch to a rom that uses the CAF based bluetooth (all lineageos based ones should, crDroid does for sure as that is what I use) implementation this won't happen. Still haven't been able to track down exactly why, but for now I'm sticking with CAF based ROMs to avoid this.

Do any of you guys having this issue have an Android wear watch? I've had heaps of issues with Bluetooth streaming being all "jittery" and just skipping since the update. However, I found this is basically completely fixed when I turn my android wear (LG urbane) off, or at least the Bluetooth on it.
Tried all the developer options for BT but hasn't made a difference. At the moment, my solution is turning off BT on my watch when I'm listening to music. Bit crap but it works.
I have factory reset the watch and cleared BT cache on pixel.
Any other ideas?

Is anyone else still having problems with Bluetooth on Oreo? I was hoping the official 8.1 release would help me, but I'm seeing no change. I have a Kenwood BT952HD, and experience issues similar to what the OP describes. Audio is plays fine, no unreasonable stuttering. But I get no song info, and can't skip tracks. Also, the pairing isn't as automatic. Every time I turn on the car, I have to wake the phone up, and wait for the pairing to complete, which takes longer than usual.
I've tried playing with the AVRCP settings, along with clearing registrations at both ends and repairing, with no luck. Is anyone else still seeing similar issues?

8.1 working fine with my Kenwood BT762HD. I use PowerAmp v2 alpha build 704 app.

OTA May 2018 Update + Car Bluetooth Music issues

Hi all,
Has anyone experienced any weird Bluetooth issues after installing the latest May OTA update (OPM1.171019.011-RZR-180509.5038)? I've realized that the BT controls on my 2015 Nissan Sentra no longer work properly. It doesn't automatically connect to BT anymore and no track information shows on the head-unit. The weird thing is that I CAN get music to play, at least.
I just wanted to know if I happened to be losing my mind after numerous reboots and re-pairing between the car and the phone.

Same for me. I can delete it. Pair it again and it works. Next time I get in the car it won't reconnect.. worked fine before the update at the weekend.
Sent from my Phone using Tapatalk

It's a fire an miss actually. Sometimes it reconnects automatically with the car's unit (alpine aftermarket) and sometimes it doesn't. I had noticed that if I get in the car for the 1st time today (for ex), it won't reconnect back and i have to cycle around the input in order to "kickstart" the reconnecting process. If I make a stop along the way, stop the car, get out (thus interrupting the connection) and getting back after a while, it will reconnect automatically without any issues. I'm not even taking it out of my pocket. But this scenario is happening since day one, not necessarily from the last update.
On the other hand, I got a smartband (coincidentally after the last update) and now, while the smartband is connected via BT, when I turn on my BT wireless headphone adapter, it won't re-connect anymore (simultaneously with the smartband) and if it does, it's without media playback. As a workaround, I have to 1st turn off the smartband, clear the BT of any active connection (And also any other device with media playback capabilities), turn on the BT adapter so it will connect full, then turn the smartband back on. And not always works like this.
So, I do have on an off issues with the BT stability and connections with various devices, not just car unit.

Strangely though my smart watch connects no problem and the stereo in my motorhome was connecting at the weekend. It's just the car ( a Vauxhall Astra) that refuses to connect unless I delete and re pair....
Sent from my Phone using Tapatalk

I can't get music to play with Spotify or YouTube. The phone connects fine, shows song info but just won't play no matter what I try.
The weird thing is that calls work perfectly. Sound through car speakers and mic works. Just doesn't want to play music.
I've tried unpairing, re-pairing, deleting, even factory reset on both phone and stereo. Worked fine before the 8.1 Oreo update. (I'm on 3 UK handset).

Im having issues as well, it will connect the first time when I manually connect the phone and stereo to MyLink. It will say connected but (No Media) so i try to pair the media and it disconnects my phone from BT and then i have to delete device and re connect device manually. As well if i leave the vehicle or turn it off then it will disconnect. Not just my vehicle but the other showroom vehicles do that as well. Can someone let me know if there is a bluetooth upgrade or a firmware upgrade that can fix this problem? is there anything that we can do for this let me know. Thanks!!

I am having the same issue in my bmw.
I can delete the phone and re-pair... But it sucks having to do that every thing.

also having issues as well. It connects to my headphones and the after market HU in my truck but it will not connect at all to the factory HU in Genesis Coupe. I have tried to delete and re pair and still nothing.

So currently it all works for me with the latest update. It definitely takes a little bit longer than normal though. Not sure how long some of you waited, but compared to my old phones it feels like an eternity during the time it doesn't connect. I also use a smartwatch and it is always connected to that. If you guys need or want any files, let me know. I'm currently waiting for a usb-c to usb-a cable in the mail, so once that is here I can try to help.

I think this is all more of an Android issue. I was having most of the exact same issues mentioned here on my LG V20 on Oreo.
I just for a Razer Phone 1 off eBay this week. I did the Pie update and within a day, the bluetooth issues have returned. Sometimes phone won't connect to car stereo - sometimes reboot stereo, sometimes toggle phone bluetooth off/on, or sometimes just wait 10-30 seconds. Doing the same showing info on car stereo display, but no audio transmitted. I also had similar issues using a OnePlus 3 with both Dirty Unicorns and Resurrection Remix Pie ROMs. I was beginning to think it was my car stereo until I read the comments on this thread. Seeing so many others having the exact same issues on factory and aftermarket stereos (mine is an aftermarket), and knowing it's happening on different devices and both Oreo and Pie , I'm thinking it's an Android 8 and 9 issue.

Bluetooth issues on official android Pie

Hi all...need some help with Bluetooth issues on my pixel 2 XL. I updated to the official Android pie today and noticed that my jbl Bluetooth earphones are having issues with calls. I cannot hear anything thing from the other side and the person on the other side can only hear some weird distortion. However I tried playing music on it and it works fine. Issue is only with calls. Anyone else facing this? I tried unpairing and pairing it again, restarted the phone, tried safe mode too but no luck.
Also I had sound echo issues with wired earphones (connected through dongle) on Oreo so I bought the jbl Bluetooth earphones and the echo was gone...and now after updating to Android pie my Bluetooth earphones don't work
Please help!

wazza1991 said:
Hi all...need some help with Bluetooth issues on my pixel 2 XL. I updated to the official Android pie today and noticed that my jbl Bluetooth earphones are having issues with calls. I cannot hear anything thing from the other side and the person on the other side can only hear some weird distortion. However I tried playing music on it and it works fine. Issue is only with calls. Anyone else facing this? I tried unpairing and pairing it again, restarted the phone, tried safe mode too but no luck.
Also I had sound echo issues with wired earphones (connected through dongle) on Oreo so I bought the jbl Bluetooth earphones and the echo was gone...and now after updating to Android pie my Bluetooth earphones don't work
Please help!
Click to expand...
Click to collapse
I have no issues wtih LG HBS730 BT headphones on calls or music with Pie. I've had four calls total, incoming and outgoing. I listened to music for about five hours too, no glitches.

I've had issues with the anker brand ones.

I have the same issue

Having issues connectingy to my car Bluetooth which has always worked before updating. Also experiencing WiFi drops.
Edit: went to stock Pie unrooted, and not as many wifi disconnects but my phone doesn't even see my car's Bluetooth connection . Fitbit connects just fine though. Weird..

Android Bluetooth is flakey as hell. Everyone gets a turn with incompatibility. P fixed my car with the first Dev preview. On O it was crud. There is a massive ongoing thread about it.
https://support.google.com/pixelphone/forum/AAAAb4-OgUsiJeDphsoOJ4/?hl=by

I had the same issue on my pixel XL on dp4 and dp5. Bluetooth worked fine for music but only crackled a little bit for phone calls. Both headsets and car were affected. Troubleshot it with Google rep and they told me my phone was broken. I also had multiple sensors stop working so auto brightness was broken and auto rotate was also broken (And a few other features like tap to wake screen). I ended up buying a pixel 2 xl and sending the other to Google as a trade in yesterday. Now I'm wondering if it wasn't just the software. I actually reset the phone and everything worked for a day or so before it failed again. I then exited the beta and everything worked on 8.1 Oreo for about a day before it all broke again. At that point I concluded it must be the phone. Hopefully the software didn't burn something up. I'm going to be ticked if this phone starts giving me trouble.

Are there any troubleshooting steps I can follow to see if solves the issue? Because it only happens on calls but music seems to be fine.

You can try rebooting in safe mode (long press the power off icon when you press the power button). I will restart with only minimal apps to see if it's being caused by a non Google app.

nukeruss said:
You can try rebooting in safe mode (long press the power off icon when you press the power button). I will restart with only minimal apps to see if it's being caused by a non Google app.
Click to expand...
Click to collapse
I tried this on my device but even in safe mode i faced the same issue

Ever since upgrading to PIE, I can no longer connect my my pioneer appradio head unit.
Phone works, but media Spotify or Pandora does not

Having the same issue, also, my "disable absolute volume" in developer settings doesn't work. I guess this is what to expect for early adopters.

I have had no issues with connectivity to my bluetooth headphones or to my car's bluetooth
However I have noticed that twice when I had phone call before entering the car and I connect to the car's bluetooth and the call is transferred to the car's audio, I get disconnected for a couple of seconds (after initially connecting correctly) and then it automatically reconnects and call continues normally ..

Android pie broke bluetooth for calls
abidhill said:
I tried this on my device but even in safe mode i faced the same issue
Click to expand...
Click to collapse
Stock Pixel XL: All bluetooth devices worked for all purposes on Oreo. After updating to Pie none of my bluetooth headsets will connect for phone calls. Bluetooth music broadcasting to speakers is unaffected. I'm going to call them about it tomorrow.

williamgrahamiv said:
Stock Pixel XL: All bluetooth devices worked for all purposes on Oreo. After updating to Pie none of my bluetooth headsets will connect for phone calls. Bluetooth music broadcasting to speakers is unaffected. I'm going to call them about it tomorrow.
Click to expand...
Click to collapse
Are you having any other issues. My original pixel XL had the same issue show up on the beta but it also affected some of my other sensors as noted in previous post. I now have a pixel 2 xl with no issues whatsoever.

williamgrahamiv said:
Stock Pixel XL: All bluetooth devices worked for all purposes on Oreo. After updating to Pie none of my bluetooth headsets will connect for phone calls. Bluetooth music broadcasting to speakers is unaffected. I'm going to call them about it tomorrow.
Click to expand...
Click to collapse
Do let us know what they say

wazza1991 said:
Do let us know what they say
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Click to collapse
Well, they seem to think that the problem is an app from the play store that doesn't play nice with Pie. Frustratingly, the problem corrects itself sometimes (but not all the time) after a reboot. They had me reboot into safe mode and this time it worked. After 20 minutes our support call was over. 30 minutes later one of my three headsets (with the oldest bluetooth version) didn't work, but two of the three did.
The tech (Jen, who was super nice but sounded like she was overseas and had to repeat herself a few times for clarity) said they only have 2 support options for this issue: 1) boot into safe mode and blame one of the apps from the play store or 2) FACTORY RESET THE PHONE! Once I explained that the phone was my google authenticator she suggested that to further troubleshoot I should turn off two factor for my google account (Ummm, no thanks. And that is why you should always PRINT OUT the QR code and put it in a fire-proof box in case you need to recover it)
I'll post back if it breaks again, but right now at least I can live with it.

Only "issue" for me is my wife's ILX doesn't seem to update the music information anymore. With the betas it did for a fee songs then seemed to stop. Now it's nothing at all but will double check today since I only drive it on occasion. Other than that, playback on our cars, Bluetooth speakers and headphones has been just fine. Love that it remembers the volume set per each device. No super low or super loud volumes on the start of playback.
Sent from my Pixel 2 XL using Tapatalk

I also have Bluetooth issues with Pie when connecting to my car (2017 Audi A4 with MMI+) I never use Android Auto by the way:
- Music playback is flaky: I have to start Play Music before connecting to the car, otherwise it cannot stream anything. Sometimes even this doesn't work and I have to repair again. This sucks, you always have to spend some time to check if everything works!
- My Radar trap warning app blitzer.de only works when streaming Audio from the phone to the car, even though I set Audio to HFP. With Oreo, the app started a phone call, it looked exactly like an incoming call. Now it only adds the warning to the phone's Audio Stream, so when listening to radio or streaming from a HDD I get no warnings.
- Phone calls work flawlessly, though

Try removing or 'forgetting' paired device and add it back again. It worked with my AirPods.