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Thank you for bringing this to our attention. Are you able to see if you are getting any specific error message? Does it happen only when you are on the phone talking? Is the phone overheating? When did you purchase that phone?
Hey there So sorry for this hassle with your phone.It seems that this is either a hardware or software issue. As such I can only recommend a factory reset as it fix many issues. This option will delete everything on your device put it back to default. You may need to back it up before taking this action. Also, if you have a Google/Gmail account your contacts are save and you should know your password before doing this operation.