I have a S3 that has been working fine for years on TW cable. It uses (2) S-cards. Yesterday the Scards started heavy pixilation. It is un-watchabble. I can play back previously recorded programming with a clear picture. I can ask for web based downloads and the picture quality is HD. The problem is with ccard tuning. I do have a Tuning adapter. I have tried to isolate Card 1 verses card 2. Both are pixilating. I look at the DVR Diagnostics and I can see Signal Strength move from 86 to 77 to 33 to 0 to 72. It is all over the place in real time. Card 2 seems slightly better jumping from 83 to 77 to 83, but the picture is still un-watchable. Does this sound like S3's tuner is breaking, or does it sound like the S-Cards are misbehaving?