WiFi/Bluetooth problem - Xiaomi Mi A2 Lite Questions & Answers

Hi,
I have noticed a pretty annoying problem with the upload speed when connected to a 5 GHz WiFi and having bluetooth enabled at the same time. Here's the problem in detail.
1. Turns off both WiFi and bluetooth.
2. Turns on WiFi and connects to a 5 GHz AP.
3. Performs a speedtest. Here I consistently get about 115 Mbps/115 Mbps/3 ms with a stable link speed of 150 Mbps. All good so far.
4. Turns on bluetooth and connects it to my headset (Plantronics M70).
5. New speedtest, same results. All good.
6. Turns off both WiFi and bluetooth.
7. Turns on bluetooth again and let it connect again to the headset.
8. Turns on WiFi and connects to the same 5 GHz AP.
9. New speedtest. Now I consistently get about 115 Mbps/40 Mbps/3 ms until steps 1 and 2 are repeated. Turning off only bluetooth doesn't help. WiFi must be turned off/on with bluetooth disabled.
I'm on version V11.0.4.0.QDLMIXM.
Have anyone else encountered this problem or is it my headset that is to blame?
It obviously isn't interference due to only using the 5 GHz band. Furthermore, the WiFi works fine together with bluetooth as long as the WiFi is connected before the headset.
I've tried to change some bluetooth settings in developer options with no success. I also tried disabling A2DP Offloading with setprop but no difference. The network works flawlessly with all other devices.
Any ideas?

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I first posted here...
http://forum.xda-developers.com/showthread.php?t=2212049
and then here...
http://forum.xda-developers.com/showthread.php?t=2381962
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Actually I now use my Nexus 7 (original) just for BT streaming and the G Pad for other use when a Wi-Fi is needed.

Bluetooth + WiFi = Non-working Wifi + Dropped Bluetooth

Alright, so I've heavily tested this with a ton of bluetooth devices and 5 access points, both 5Ghz and 2.4Ghz.
When I have both wifi and bluetooth on, with the device connected to both services (both a BT device and an AP) neither radio works. WiFi says connected, but doesn't load anything, can't ping out at all. Bluetooth will find the device, connect, and disconnect within a few seconds.
I tested the same devices but only using one radio at a time and all the BT devices stay connected with WiFi off, and all APs are connected and load data with BT off.
Does anyone know what's going on? I've suspected this to be an issue since 4.0, but it's still around in 5.0.1. It's persistent across ROMs and RUUs, so it can't be a rom issue. Currently I'm on Viper 4.6.1, S-off, SCID (although this happened before I S-Off'd as well)
Does anyone else experience this issue? Any potential fixes?
I run into something similar periodically...
My 5ghz wifi always works no matter what.
2.4ghz / bluetooth will work for 2-3 days... then it stops... no 2.4ghz SSIDs show up in wifi and no bluetooth device will connect... Even turning BT/Wifi/Airplane on or off in any combo. Only a reboot will fix it.
My friend also started having this issue.
I've been all over and no one has a solution. I use an android wear device, so bluetooth is necessary :/

Wifi cuts out when bluetooth is in use

Whenever I have both bluetooth enabled (and paired with any device) and wifi enabled, and I'm streaming music (Spotify in my case), after several minutes (almost randomly), the internet will stop working. Meaning, the WiFi icon will still show as connected, but it can't connect to anything online. I typically have to disable and re-enable WiFi for it to work, but then it would do the same thing again.
The strange thing is, my Galaxy S4 had the exact same issue/behavior. On both devices, I've seen this behavior regardless of the type of WiFi connection and/or bluetooth device (I've noticed it with my skullcandy headphones as well as my Sync in my car).
Do these devices share the same bluetooth/wireless chipset? Is it an Android thing? I'm forced to either use 4G with bluetooth, or WiFi with wired headphones. Thanks.
EDIT: this is using 5ghz Wifi.
What version of android are you on ?
carrier phone or unlocked. Some times these issues are carrier specific and non existent on others.
If you go into settings - wifi
Uncheck any option that says switch to data if wifi is unavailable.
I can confirm that this is an issue, I experience the same problem on my g4 818p
Sent from my LG-H818 using Tapatalk
WiFi goes on 2.4ghz or 5ghz(most commonly on 2.4ghz) Bluetooth works on 2.4ghz. Unless you are 1m from router, BT is going to butcher your wlan. Had the same problem before. Solved it by buying dual band modem-router.
You could forcing different channel in wlan settings.
http://smallbusiness.chron.com/fix-bluetooth-wifi-interference-71008.html
idea here is reducing interference to bluetooth from competing sources.
- switch off wifi and use data which the OP is doing. Curious that the problems occur even at 5Ghz. Would have thought that band would be relatively immune to 2.4ghz sources.
- reduce the distance between bluetooth device and phone.
- move away from any sources of wifi interference if wanting to use bluetooth.
And now from the ppposite direction. Preventing bluetooth from interfering with wifi
http://www.goldtouch.com/stop-bluetooth-interference-messing-devices/
Read the comments below. similar to the OP.
The key is more management of the problem rather than solution.
One Twelve said:
What version of android are you on ?
carrier phone or unlocked. Some times these issues are carrier specific and non existent on others.
If you go into settings - wifi
Uncheck any option that says switch to data if wifi is unavailable.
Click to expand...
Click to collapse
I'm using the Verizon variant.
this issue hunted me on all software version
Many options live
Router: Try another chanel
Router: Try only 2.4 or 5 Ghz
Router: Try only N or try only b/g/n mixed
App: Delete tunin radio
Last options send back service mainboard change.
i m facing the same problem but only when i do cellular call,
i am using realme wireless earphone , when i used to call my wifi speed gradually decrease , and after that stop working completely..,
after disconnecting the call i need to OFF and ON to work wifi again....,
My wife got the same issue with a Samsung A40 (and before with a Motorola), when using 2.4 wifi and Bluetooth connections (band and speaker for instance) the wifi is hanging. With wifi 5 it's ok. I don't have any issue with my phone using same network. It's crazy.

Bluetooth / WiFi interference

Hello
Anyone encountered this? If Bluetooth is switched off (MM) and WiFi as well, the WiFi drops, slows down to a few kbps - all sorts of problems. Bluetooth OFF - and WiFi back to normal.
Someone said this is because of BLE switched on - however, I don't know how to switch it off permanently.
Also, moving to a 5GHz WiFi isn't an option - I am using as a carputer and I cannot tether on 5 GHz with the phone.
Any ideas?
Michael

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