Same Here, since I have avoided live OTA no freezes!
I had another interesting problem with my 722k that I don't know if related. I had a timer going and decided I wanted to stop the recording, the receiver wouldn't let me stop it, no way, kept thinking something else was watching it. So I went on line with Dish Remote Access and deleted it there, worked like a champ. If my receiver freezes again before I reboot I am going on line and see if I can control it there. But no freezes since avoinding live OTA.
Michael
I have had that issue with my DVR and had to go to TV2 to stop the recording. I also had an issue where the autotune would not work. I think this software has become so complicated and filled wth bugs.