Have you tried letting it idle at powerup to warm up for a few minutes and then reset? This sounds pretty much like a warm-up issue with marginal signalling somewhere. Can be extremely hard to find...
You may be able to get an improvement out of a (generally but not always) more stable Buster 11 but then again you'll only know once you've tried. I wish someone would make a decent, fast Buster replacement but that won't happen. You've tried moving the Cybervision to another slot, haven't you?
