Aljazeera Channels
The TP of Aljazeera is very week. If your cable from the dish to the reveiver is longer than 50 feet, you will experience this problem. Recheck your dish orientation and make sure it is directed perfectly in order that you get max signal. If you still have the problem, probably you need LNB amplifier to boost the signal. Available at Radio Shack.
That what I did and had no problem since.