After years of running flawlessly, recently, roughly a minute after turning on, the unit starts acting as if it had a mind of its own, or as if someone else had hacked into it. The screen change rapidly as if someone were touching it, but I'm not. It stops responding to my touch and sometimes stops acting on its own, too. It really looks like it's possessed. Never returns to normal unless I turn it off. Updating the software to version 5.60 didn't help. Resetting to defaults didn't help.