Hmm, I've got a 922, 722k, 722 and a spare 622 and don't have this issue. Now that doesn't mean it doesn't exist but I've never seen one cause this type of problem. The box talks to the LNB on 950-2150MHz.
If you guys really think its the box you can get it replaced, just call them up and tell them it fails up power up. Usually you'll get a replacement within 3 days. Its worth a shot and wont cost you a dime.