Even my local ME-TV station OTA has this problem. The picture will completely go away after pixalating a while. I know it is the Satellite feed because only the local ID Bug remains. I 'll have to check the FTA feed next time.
I believe I did a blind scan on AMC2 the other day and the missing NASA Channel was there. I believe it was AMC2. It might have been AMC9 but if I remember correctly in was AMC2. It said NASA Mission Control.