LG G3 D852- Sim network not found. Phone will restart - G3 Q&A, Help & Troubleshooting

Hi, guys I have virgin canada LG G3- D852 just over year old and since few days it keeps saying "Sim network not found. Phone will restart"
My phone then restarts, sim is found ,it works normally for 10mins and then again I get same message and phone reboots again.
Remedies I've tried so far:
1.Deleted cache
2. Factory reset done
3. Removed sim ,cleaned area and reinserted into sim area.
So far all the above steps I've tried have failed, what should I do now, this is getting really frustrating!
Please help!
Phone is running on android 6.0

Check sim pins, they may not touch cim card at all!

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You flashed your phone with the AT&T ROM ... and you are not on the AT&T network. This ROM detects the SIM and if it is not AT&T it will shutdown immediately.
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Maybe it's hardware error?restore your phone to it's original state and send it to warranty.
Have you swapped the sim while it was on?the g don't support hot swap,you need to turn off the phone before changing sims.
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Hello all, I just bought an LG G3 international version from amazon. came with android lollipop put my sim card and made a few phone calls worked fine. After that i updated the phone to marshmallow which was one of the biggest mistakes of my life :crying: first i lost signal can't make any phone calls or sms. when i went to the menu to see if i can unlock my phone it said "this phone is permanently locked and cannot be unlocked" how can this happen ? i didn't enter any code not even once ? also noticed my device name changed from d855 to d855v. i tried every thing even got the phone back to factory stat 3 ( kitkat)
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RonyJoe2 said:
Hello all, I just bought an LG G3 international version from amazon. came with android lollipop put my sim card and made a few phone calls worked fine. After that i updated the phone to marshmallow which was one of the biggest mistakes of my life :crying: first i lost signal can't make any phone calls or sms. when i went to the menu to see if i can unlock my phone it said "this phone is permanently locked and cannot be unlocked" how can this happen ? i didn't enter any code not even once ? also noticed my device name changed from d855 to d855v. i tried every thing even got the phone back to factory stat 3 ( kitkat)
still nothing. is there any hope for this phone ?
Click to expand...
Click to collapse
Go here
http://forum.xda-developers.com/lg-g3/help/phone-permanently-locked-unlocked-lg-t3371229/page1

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