I think the tv goes into sleep mode too quickly. Take a look at setup to see if there is a time setting for that, if there is, then set it to a longer time. Like I said..I am just guessing here but it might be logical (at least in my mind, hehe).
There seems to be a problem with the TV in which whenever the video has a lot of black or dark colors on the screen, the screen goes black completely, as if it has shut off. The audio still comes in but the video isn't there. This doesn't happen randomly and it only happens in situations where there is a lot of black or dark colors in the video. If anybody knows what could be happening with the TV and how to fix it, that would be great. I've read around about it being a problem with capacitors and such, but those also regard to the tv blanking out in random intervals. Any help is appreciated.