We're long-time DirecTV users, and have had a THR-22 for about two weeks. It occasionally 'stutters,' like its losing the stream, but usually recovers after 5-8 seconds. Video gets pixelated and audio drops pretty much completely.
I don't think it's poor signal strength--I've not noticed any problems on our other receivers, including an HR-34.
It doesn't happen a lot, but it's enough to be fairly annoying. It seemed to happen most often at first, and I thought maybe background processes were creating contention for disk or memory. It did seem to settle down, but has been happening more frequently again.