I had a Dish tech come to fix the low signal level issue I was seeing. He re-aligned the dish and replace the ground block that had been in service since I got Dish over 5 years ago. He said water got into the connections and corroded them. My signal levels improved by over 20 points, so I was happy. Less than a week later one(by not the other) of the TVs starting having a problem with all channels getting all blocky. Eventually the receiver lost the signal competely, and I was stuck on the "it should take less than 5 minutes to acquire the signal" screen that never completed. A dish tech from the same company came out the next day and said one of the connections on the new ground block looked "burned," and he couldn't explain what happened to it. Everything was fine again after he replaced the new ground block with another one. Now a few weeks after that the same receiver is starting to get blocky again, but hasn't gone out completely yet. It's not a receiver problem because when it went out I moved the receiver from the other room into this room and it had the same problem. Any ideas on what's going on?