Power inserters are the number one cause of signal loss in a DPP44 eqquipeed system.I finally got DISH to replace my DPP44 system (110, 118, 119, 129) with eastern arc and I haven't had 1 searching for sat signal in the week. 1.5 years of barely be an able to watch one of my receivers with no problems now.
It confirmed my belief that the DPP44 switch/power inserter was the cause of my problems. I replaced 3 switches and 2 power inserters.
When I get a service call on one of these the first thing I do is check sigs on my meter at the dish to make sure the issue isn't there. Next move is the power inserter.