A few months ago I added a Dish PVR-501 in parallel with my DishPlayer. But the PVR started having problems. Some recorded shows would stop with a dialog box about part of the transmission being lost due to signal loss. I called Dish tech support and we re-booted both machines. But the problem remains. I called Tech Support back and they suggested swapping cables to the two receivers to decide if it was a receiver/dish problem. I swapped cables, but noticed little change. Now I am noticing heavy pixilation blocks on recorded shows on both the PVR and DishPlayer. One transponder (110 - 1) has a signal strength about 74 which Dish says is marginal, but my installer says is good. I also told my installer about pixel-blocks and the signal problems and he said he saw some of that on his system, implying that there is nothing I could do about it. Anyone experience this before? Any suggestions? I'm about ready to pay my installer to come out and do a "tune-up". I want him to re-align the dish and cut/replace the connectors on all the jumper cables to eliminate corrosion. (The Dish went up about 3 years ago). Any advice?