I have had a similar (but somewhat different) issue the past 2 days as well with my 722. The unit refuses to power on first thing in the morning because TV1 is "not ready". The first day I solved the problem by unplugging my Sling Adapter from the USB port. Figuring that was the problem I left it disconnected. Second day (this morning), I had the same issue despite the Sling Adapter not being plugged in. Only way to get unit to start was to switch modes back and forth to "trigger" TV1.
Not sure if this is related or not, but I figured I would add my experience in case it helped.