I have two 211s and they have both started freezing and re-booting within the last few days. I only happens when I tune-in channel 2.1 (OTA, PBS). The remote then becomes useless. No response at all. Finally, after endless re-boots, the remote will work.
This happened to me last week while watching the sub channel of our local ABC affiliate on my 211.
The receiver kept re-booting, the remote was non functional and the buttons on the receiver would not work. I couldn't get off the problem channel until I disconnected the OTA antenna during one of the re-boots. I wondered if the problem could be software related. Needless to say I haven't tuned in the problem channel since then. In fact I locked it out using channel locks just to make sure.
I reported this on the "other" forum also and 2 or 3 others chimed in with the same problem.