I have an old R-15/500 that I purchased from Direct Buy in Dec. of 05. Up to now, it has been flawless but lately it shuts itself off. Actual, it loses the picture. The sound is still there. The Power light goes off and the record light comes on. The Blue circle stays lit. A quick red button reset fixes the problem. This only happens occasionally with weeks in between failures. Is this just a hiccup or is it trying to tell me something?