You know, I still think it has something to do with Satellites being activated or not.
I've been using mine with all my sats activated, and it's been great, no issue at all.
But, the other day, I decided to de-activate one or two sats, I don't remember the exact number, but I know it was at least one that I had channels scanned in from.
Within a few minutes, it re-booted for no apparent reason.
I went back and activated the sats again, and not a problem since then.
Could be a coincidence, but I think it might be worth looking into.