I had the over heating on all 5 of my G4. When subjected to enough heat/cold cycling the phone's soldered connections loosen up and fail. Next is the boot loop and the inability to function. Big V suggested the typical fix -WIPE the phone. Having done my investigation I pointed out that an update is being tested. I asked him how a firmware/ software update could remedy the broken solder joints. To the point - DO NOT TRUST THEM. DO YOUR RESEARCH (keeping in mind Verizon has bought the first 5 web pages to engage in disinformation. DOCUMENT EVERYTHING. ONE GOOD OVER HEAT WE ABSOLUTELY COMPROMISE THE DEVICE.