My Onkyo has locked a couple of times. It still worked and played whatever it was doing, but I could not turn it off or use any of the other functions on it. Basically it was stuck doing what it was doing. Only way to terminate was to kill power as well. It works fine after that, but each time I've had to do it I have had to put my calibration settings back in again. It's only happened 3 or 4 times in the 5 year's I have had it, so it hasn't been annoying enough to do anything else about.