Experiencing same problem, started early this AM, seemed to correct itself, but have been missing some channels last few days,
Problem resurfaced again, lost ESPN2 earlier this week, & now down to just the A's, tried rebooting everthing to no avail, will be gone for a few days, hope there is a solution by then !!!
I'm having the same issue and I've removed the channel, added it back, and restarted everything and still no luck.