I think I found a bug. no particular program I was running. I had it plugged into the charger. It finished charging at some point, wasn't paying attention to the time it finished. when i picked it up I noticed the icons on the left menu were reset to default, icons at the top right were default aswell. advanced power and advanced brightness were gone but the apps were still installed. I'm pretty sure all my apps were still there. There was no rotate icon up in top right, but the power button made it rotate. and rotate settings were still there. Personal launcher and personal menu were gone too. I did a hard reboot and it all went back to my custom setup and nothing was lost. I am attempting to recreate, and will get pictures if it happens again.