I went through 10 921 DVR's and one 942 before finally getting a stable unit: a 622. When the 622 arrived I purchased a UPS (battery backup/surge protector). That seemed to alleviate the short lifespan the previous models had. You do have to put your DVR (any DVR) on standby from time to time, otherwise it can't update the software. It's not to "rest" the unit! Have you tried appealing your case to a higher level? Maybe one of the DIRT team menders could look into your case.