Update - You Won't Believe this!!!
Well, found the problem that was causing the "lost signal" popup on all 3 satellites @ whatever random time and you're not going to believe this, but it's true...
While trying to watch MIB 2 on TBS (sat 61.5), the problem became worse. The pop ups were much more frequent, about every 20-30 seconds. This became very annoying, so here's what I did. I wanted to see if both tuners would do this, so I turned on the PIP. Well, what did I see in the PIP? My OTA... For about the last 30 45 days or so, the OTA around here has been suffering from "ducting", all kinds of crap trying to come in because of the weather, which has resulted in co-channeling & dropouts on my local OTA.
I did a PIP swap & put the OTA in the main window & saw the signal strength was about 70-71 (this on the same channel that I usually get 90+ on) and fluctuating, dropping out about the same rhythm as TBS HD and the others (including playback of recorded items on DVR). I changed channel to a different channel, a satellite channel, and lo & behold, this thing has not lost signal yet!!!! even with the -6 to -7 LNB drift, have not had a problem.
Lesson Learned to share with everyone here: Do not leave the PIP source set for OTA, if you get signal loss in that configuration, you will get the pop up for signal lost on what ever satellite you are tuned to, even if you are watching DVR!!!
btw, this also fixed the problem with the unit locking up trying to get to the Point Dish screen that I mentioned earlier....
I'm sure glad I got this one figured out, hope this helps someone else on here!!!