I've got a new 625. I bought a used DP34 switch on ebay. I keep getting switch error messages. The first evening I hooked it up and activated it worked fine, the next day it started giving me problems. Is the DP34 switch the right one to use? Could the switch be bad? Is there another switch that can be used? I want to run more recievers off of it. Some times it will run the switch test and say it is ok some times it will say it is not. Any ideas or suggestions?