I am a proud owner of a second 622. Had the first one about 18 mos. and no trouble until the dreaded HDMI failure a couple weeks ago. New unit received. All goes well until this eve. While watching Sci Fi HD, the picture suddenly froze. Nothing could bring it back to life - no response on ANY remote command. Did a soft reboot. Worked fine for about 10 min. Same thing. Another soft reboot. Same results. Could this be a heat issue? Are these symptoms typical, or could some other type of malice be afoot? The unit is in a cabinet w/glass front doors, a 6 in. clearance on top to the bottom of the upper shelf, and a medium size vent hole in back of the upper shelf. The only other unit enclosed is a PS3 on the top shelf ( it has been off for over a week). This set up had worked fine for the other unit. High temp indicated 141 and avg temp 127. I'll try a hard reboot later this eve. Any help/info?