As i am typing this, im watching a show on NATGEO, and what has been happening in the past week or two, is that my HD channels at times seem to "cut off". What i mean is that its like when your watching a movie and the disc is scratched type of thing. The picture goes dark for a second, you can still hear audio but again the audio also sounds "scratched", then the picture comes on again. Its happening repeatedly now, what is it!