Very uncommon, but possible I suppose. Call Dish Tech support and trudge through all their troubleshooting. If is has gone bad, you should get a replacement. If not, then back to square 1.
Well, I just got off the phone with Harmony. Went to a level 2 tech, still can't get the Harmony to work the 722k. Harmony advises I call Dish about the "IR" sensor, since it doesn't want to respond to "IR" commands from either remote.
Damn, I hope it's not my 722k, I have a bunch of programs on the HDD I haven't watched yet.
Ghpr13