This is the 2nd August in a row I've had problems with my 622.
Last year, it started locking up. I called tech support. They scheduled a visit in a couple weeks.
While waiting, I moved it to another location, and blew air in it. It worked fine. I eventually stopped using the fan, and it continued to work in it's new location. I cancelled the appointment.
Yesterday, started acting up. I turned it on, it ignored the DVR button. I unplugged it, it came back up fine. Then, a little later, rebooted and displayed a warning about my drive, and stated that DVR functionality would be limited (didn't even pause anymore).
I found my fan, and it is working again a day later.
I suspect that the August temps (106-108), and the fact my DVR is on top of the entertainment center, causes the problem. Enough heat up there that I need to use the fan.
I sure hope it continues to work. With travel plans later this month and September, and the start of football season, I expect it will be tough to get service. Especially since it is expected that locals will be on HD here anytime now. Since they require 61.5, the installers may be busy.