Chosen Solution
I do a reset, not working I downgrade the firmware to 4.4.2, not working Re-install the 5.0 lollilop, not working So, what i can do else? i heard that possibly it can be the MotherBoard.
Mine did the same thing and when I took it to best buy they said it was the battery, and sure enough when I popped a new battery in it fired right up and ran flawlessly
i will say replacing the battery with multiple new ones around the shop helped me for a day or two then back to the same thing. i’ve yet to put a new battery cover on to try out a new set of contacts from a new power button flex, that’ll be my next move.
