First off my equipment is 625 dvr unit using dpp 500 sat there is a diplexer ouside at dish and one inside at the unit, there is also a dp seperator assembly. The problem is sometimes more than not i get the searching for signal screen on numerous channels. So first thing I replaced both diplexers with new matching pair from my local dish company. That fixed it for roughly a week it worked sweet until today. Any suggestions would be greatly appreciated THANKS