I am hoping someone here can ease my concerns or help me determine what is wrong or what to do. Recently while watching TV (cable signal) I have noticed a strange colour fluctuation about twice an hour (no recognizable pattern or timing, just an estimate). It is difficult to describe, but basically the picture appears to have a wave of red and green pass over the screen, it usually only last a few seconds, and there is no other change in the picture. I am hoping that it is not a problem with the TV, but whatever it is I would like it to stop. Could it be caused by power fluctuations, or a weak cable signal? I live in a high-rise condo, so power fluctuations are common, but have never caused a problem before (been in the same place for over a year). I recently had a HDTV cable box, which I demoed for 2 months, but I returned it about 3 weeks ago. Last night I had the PIP on and noticed the effect, but it only appeared in one of the pictures. I left the TV unplugged last week for a while in the hopes that it would reset something, but the problem persists. I think my next move is to call the cable company, but I would love to hear any other thoughts, suggestions or similar experiences. Thanks, Brian.