One more quick thing...I have not noticed a relationship to the channels we are watching when the problem occurs. From a quick look at the segmented programming on my DVR, this has happened on AMC, Fox, CBS and NBC. Probably more channels than that, but those are the ones I can verify since I have not been logging the details of each reset. Mostly I have been saying something like, "(expletive deleted) not again!"
Anyone who was of age in the '70s will probably get the "expletive deleted" reference. Anyone who doesn't, it's worth a Google!