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hi. i have an issue with my note 2 i317m. since a week or two ago, some friend and family have told me that they cant call me, but i see that i always have 3 or 4 signal bars, i never see the phone whit no signal, i restored the phone and updated my firmware to the latest on my contry (telcel from mexico) and it keeps happening, i also flashed custom roms like d3 and skynote and diferent modems but just to get the same ressult, i noticed that when i havent used the phone for like 20 minutes this problems happens, and this mostly happens when the screen is off, so when i turn on the screen and make a call i can do it with no problem, and i can receive calls for like 20 minutes before the signal drops again.

yesterday i set the phone to only gsm and the problem was gone, all calls made as test went well, but if i set it on lte/wcmda/gsm or even on wcdma/gsm this issue comes back.

i hope you can help me to fix it because i dont want to get stuck wit gsm only.

the phone is a i317m
baseband i317MUMBLL3 (this is the last one from telcel mexico, but i also tryed rogers one)
no apn changes

thanks, any help will be apreciated
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