recently after about two months ago, I get a constant green flicker all the time whether I am watching tv or recording tv. It still records normally and doesn't seem to be affected by the flicker, but it does this on all outputs. I usually have to leave the unit turned off and unplugged for 1-3 days and whenever I am not home try to remember to unplug it. anyone know where this green flicker comes from? How to fix it?