Why is my HTC turning itself on and off every few seconds?

[AC Question]

htc turning itself on and off every few seconds

My htc one m8 keeps turning on and off every few seconds can someone please help

 

[B. Diddy]

Re: htc turning itself on and off every few seconds

Welcome to Android Central! Is it just the screen coming on, then going to sleep, then coming on again? Or is the whole phone shutting down completely, then powering on again and rebooting? Did you recently update to Lollipop?