You may want to take a look at the ViP612 L6.00 Software Experiences/Bugs Discussion thread which has posts like this one:
My two week old 612 has had no serious problems though playback does stall at times and the control is a bit kludgy compared to my 722. But there appears to be folks happy with their 612's so you may want a replacement.Rotryrkt said:I just installed a new 612 and have experienced the OTA dropouts as well. I am having periodic lockups, BSODs, and slow-no response to remote commands. After replacing the HDMI cable and rebooting, check switch, and yet another front panel reset, things seem a little better tonight.
I have a 622 on my primary TV and it has been rock solid lately. 612 is on a new Samsung DLP 1080p in the Family room. OTA signal levels are definitely lower on the 612. Hopefully just growing pains. The 622 had similar problems when I first hooked it up, but it has outgrown all the early glitches. Hopefully, the next SW upgrade will be more stable.