I'm having similar problems
I am wondering if it is the HDMI cable that the DISH retailer guy gave me.
Well, I have a 622 and I first started losing sound. Then I started losing picture and sound (remote TV works fine). Now if I bend the HDMI cable near the 622 HDMI port, sometimes the video (and sometimes sound) comes back on. But basically it is unreliable. I have a Philips LCD 37" with two HDMI inputs. The video/sound doesn't work for either of the two inputs now.
I also changed to component and using the RCA for audio -- and the HD programming that I recorded looks almost HD quality. But yah, why should I have to do this? Is it the cable or the 622 HDMI port that is the problem? I
Right now, though, it's kind of moot b/c I am dealing with reception problems here in Hawaii and I can't pick up the 110 -- I think my 1 meter is misaligned or something, even though the screws and set up seems really tight.
Someone mentioned, unplugging the satellite connections and running check switch to clear the matrix. Is it worth a try? Otherwise, I have a local retailer coming sometime next week, between 8 to 12. I really hope he comes closer to 8am, as I got to get to work.
Will in Honolulu