I have slimline 5 dish and 1 HR21? HD dvr reciever. A lot of my HD channels have been freezing and pixelating and I noticed I have some really low signals on sats 103 and 99. So I call Directv and she says to reset it by pushing red button. So I do and all my problems seemed to have disappeared. How can a reset fix that? The signals on the 2 satellites I mentioned where in the upper 30's range. Enlighten me