said by beachintech:
Because DVR's have two tuners, and you were looking at the other.
No, the box that froze was non-DVR. Sprout broadcasts on 741 MHz, but when I checked the diagnostics on that box, it was trying to look at 5XX MHz (don't remember the exact number... should have written it down).
Once I changed the channel on that frozen box and changed it back, diagnostics showed Sprout on 741 MHz with a normal signal.
I'm sure that the frequency was not Sprout's... and that box is not a DVR and only has one tuner.