It sounds like interference of some kind, but if you've tried different outlets, I'm not sure what it could be.
CRT TV Samsung TX-R3080WH about 2 years old suddenly has moving lines. They sometimes are diagonal and seem to roll up and down. They will become more and more vertical and switch to the mirror diagonal getting narrower than the entire proces starts over. The behavior is unpredictable but constant. I've unplugged everything from the TV and even plugged the set into several different outlets on different circuits but the problem is still there so I'm convinced it's the TV. Any help on what this could be in the set itself?