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I assume you have two sw21s ith the dual setup. So try trading the sw21s and see if the problem follows. While doing this trade be sure all the connectors are clean of corrsion and tight.

I've had standard RG6 buried for years without a problem, but to extend the life use pcv pipe to thread your RG6 through the ground or even "garden hose".

check your all yor RG6 connectors(at lnbs,switches, grounding blocks,splices ect) to see if they are clean & tight. corroded connectors can cause intermittent loss also make sure the dish has clear line of sight(no tree limbs,leaves, ect anything that could move in front of dish in wind)) and...

unless you live where you have lots of snowfall, a cover isn't going to help. for a cheap temporary cover, place a large garbage bag over your dish, this will keep snow from building up in your dish.

Takes time, must have 110 signal also to help insure full guide download, turn receiver off at night

are you sure the dish hasn't moved? do you have another receiver to test with?

sounds like the 721 to me, 721 is sensitive to certain setups,(diplexer may be confusing the 721) also could be a 721 tuner going bad(a known issue)

do a google search on your model switch, or list the model here so someone can see what you have and possibly help you

of course I have no experience with voom. (but 30 sounds extremely low) this may be the best that it does, but I doubt it. (saw another site posting that 30 is low end signal and that the "posters" were able to get 55-58 level signal on their installs, so this would indicate that you CAN do...

check the website of your local WB channel, it should say what they are broadcasting

You can get S-Video and Audio cables in long lengths. I have 25 feet cables and get good results. Also there are S-Video amps to boost and run more than one S-video from a single source. Of course these cables are fairly large and most people would want to run them out of sight.