Dish Network Play Maker Sat Antenna Problems

We have used an older generation Winegard Carryout Dish antenna for 5 years and it has worked very well. The downside though is that it requires 2 cables. One for the satellite receiver and the other for power. I thought it would be good To have one that receives its power through the receiver coax cable so that I only would need to deal with one cable. So we purchased a Play Maker unit. The problem is when changing channels it looses signal and requires resetting and new signal acquiring. i spent about 2 hours on the phone with Dish last night trying to sort it out with no luck. Their conclusion was that there is something wrong with the wiring in the trailer. What could be the problem? The previous Carryout Dish worked just fine with the same trailer wiring. By the way the receiver is connected to a dedicated satellite coax connection and not the cable connection.