yeah it could have some problem with the ROM if you had installed any custom Rom but that haven’t thus i don’t think there could be some problem with the ROM but either with the phone’s firmware or hardware or with the network operator. Anyways have you ever tried resetting the firmware of the phone? because it might be possible as there could be some problem with the firmware that you have installed in the phone, thus you should try to reset it once.
But while doing this you should make sure as the data that you have stored in the phone will be wiped out and that wont be recoverable as well, thus it would be better if you simply make a backup of crucial data that you want and then only proceed with the same.
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