Ok, I woke up a bit late this morning and wasn’t real sure why, then I remembered I didn’t hear my alarm on my phone go off. I check my phone and turn it on, it was plugged in all night, and it comes on but nothing I click fires off, I can swipe right to get to my apps and left to get back to start screen, and that is it….gotta love betas. I tried everything holding power button for long periods of time, both with screen on and off, nothing, nothing at all helped, even tried it while plugging it in. Nothing worked, so I start to search for what my options are since I cannot remove the battery on my HTC One M8, and find a post that tells me to press and hold both the power and the volume down button for they said 5-10 seconds but I think it probably took me 20 seconds, but low and behold it rebooted right back up and started working fine again. The weird thing though, my phone was plugged in all night but only made it to 49% battery, so at some point the charging of the phone actually stopped. This is the second time I have had my phone lock up tight and the only way back to a usable phone was to do this procedure. Just sharing in case others have similar issues and need to find it as well, this works on Windows Phone 8 and 8.1 as well by the way.