When we got our last camper 10yrs ago I had trouble with the same thing..I found all of the connections for the satellite and antenna were loose..They just screw the connections on and not tightly. On the outside I remove the 3 screws on each input (sat1,sat2 and cable/antenna) and tighten them slightly with a wrench..then go inside at each wall-plate where outputs are and remove them, tighten each one..Pulled the one where the booster is and tighten all of the connections there..This yr we started having problems with the OTA and ended up finding that the cable going from the booster to the antenna had a cheap female to female connector loose..UPDATE: Think I fixed it....started troubleshooting....cable first. Ran Cable direct to receiver instead of through the RV hookup. It worked! I can change channels as I did before with no issues. Unfortunately the problem is internal to the RV. I cannot get to any of the cable so now have to run cable through a window to the receiver. At least it seems to be fixed!! Thanks all.....