This is an indication that the problem is NOT the receiver, possible weak signal or dirty power to reciever.
Odds of getting 5 defective 622 are so small as to be inconsequential - look elsewhere.
Some reboots are software, perhaps triggered by weak signal or dirty power. l4.02 for example fixed an obvious one that hit some of us.
However some are cleary due to some hardware problems particularly in some runs, ie my recently replaced receiver which regularly had regular BSOD/screech reboots.