Setup....722 with Dish 500 looking at 110/119. DPP Twin. Wing dish 500/DP dual looking at 129. 65' RG6 swept coax between dishes. THIS SYSTEM HAS WORKED NORMAL USING THIS SETUP FOR OVER 4 YEARS. Last week customer started getting Partial or Total signal loss message when the channels using tsps 32, 30, 28, 20 on 129 were selected. Looking at the Point Dish screen showed all tsps on 129 at normal signal levels even though the messages were being displayed. Check switch test displayed under 129 NC rather than DUAL. 1. replaced DP Dual, no change. 2. replaced DPP twin, no change. 3. replaced connectors, diplexers, separator and 3ghz gr block,no change. 4. ran new RG6 between dishes, no change. 5. ran new RG6 from main dish to 722 {45'}, no change. 6. plugged 722 directly in wall outlet by passing surge protector, no change. Through this process used another 722 as well as 622, no change. Took customer's 722 to shop connected to 1000.4 WA dish and it worked as it should, not displaying messages. Both 722's and 622 have current software. Called Dish and they were at a loss after the details of testing were explained.......Any thoughts, Guys ???