I guess I am lucky, I have had the PDN for several days now, and have modded with a new microSD card, running PandaHome with the Volume Keys Hack. I had been reading the Kindle app and listening to MixZing play in the background. Then I got called to dinner, I quit the Kindle app, stopped MixZing from playing (left it in the background), and put the PDN to sleep. When I came back from dinner, the device was wide awake and frozen. I could not even power down. I plugged into the USB on my desktop and issued the reboot command... that worked, and it is back to normal. I am going to change MixZing so that it doesn't stay loaded when not playing anything. See if that helps. I guess this unit has some issues with sleep mode.