This happened to me for the first time a few days ago, and I didn't think much of it until it happened again today. This is the second time I've unplugged my S4 when I woke up, only to find the phone is totally frozen. The screen won't turn on, the buttons are unresponsive, etc. However, the notification light is still working. So, nothing looks out of the ordinary until the actual unplug, which usually wakes up the screen immediately. Today, when unplugging the device (and a few days ago), I unplug the device to no response, other than the continued blinking of the LED in green, signifying I have new emails. A simple battery pull and restart obviously solves the problem, but if this is going to happen regularly, it's going to be quite a nuisance. For reference, when I restart the device, I do have a full 100% charge and it doesn't seem to affect battery life in any way. When I plug it in at night, I make sure the only two things running are Snapdragon Battery Guru and Light Manager. Everything else is shut down. I looked around but couldn't find any reports of it happening elsewhere, so any suggestions would be appreciated.