Check your signal levels when it rains. The manual, install diagram and training videos all clearly say you must have 3Ghz certified coax from the NOde to the Hopper. From the Node to the Dish it has to be 2 Ghz, to the Joeys most anything works.
The 3GHZ is needed as the 3rd sat is carried on the higher freq.
If there high enough to meet standards you are OK. There is a chart around here somewhere stating what they should be on a clear day based on City