Are you sure it means production run. I have seen where difference like that might also indicated different locations, but my guess is this unit is only made at one place. Production runs might be correct or could also be board revisions. From my experience, it is production runs where changes are made and given the how new the 622 I would not be suprised if there was not some minor changes. I definitely agree with you that there is more to it than board revisions. Polls like this in the past have always turned mixed results. Looking back at this one and compare it to the 3.56 poll and numbers don't jive. Should have been more explicit with rebooting issues and lock up scretch because those two issues I believe are partially hardware related. Numbers don't jive and I think that the reason is that people voted if they had ran into any problem. Kinda of similar to the last poll that was done where it simple asked is your 622 having any problems or not. I voted my C box has problems because the problems are extreme (Multiple times a day). Someone else might have seen a reboot once in a week and mark the same answer. Like all these polls, I take it as a sample and try not to read too much into it. Like I said, I have a "C" and I have the spontaneous reboot issue and lock scretch issue. I have a replacement coming my way and i do believe it is hardware related. I have had a 921 in the same location without any issues. I personally think I got a lemon and it is not an inherent problem wiht a particular version. I find it promising that people have swapped out and the issues have dissappeared. I will report back what happens with my swap out.