That was really weird.......I had it charging while it switched to ART, and once it rebooted I picked it up to test it out a little bit, and it seemed really snappy, but then I went to darken the screen with the power button on the side, and it wasn't responding. I couldn't get it to just make the screen go to sleep so I could continue charging it and it was extremely warm. I rebooted it to let it cool off, and it still wouldn't let me put the screen to sleep. Switched back to DALVIK and it works fine again.......any ideas?