Since updating to Lollipop, occasionally,



My guess was that some system or application software gets stuck in a loop, consuming power until the phone shuts down. So I started regularly closing unused apps and web pages to see if this had any effect, but it did not.

My phone still reboots, turns itself off intermittently or sometimes turns off and won't turn back on. At this stage, I think the only real solution is to get a new phone.