I seem to replace my VCR's about once every 6 months. they all do the same thing--play fine until one day they will play NOTHING. I get a great deal of snow/static across the picture, and can barely make out the video. I have regular sound. It is as if the tracking is way out of wack. I have lost count on the number of VCR's I am replacing. Primarily the VCR is playing kid's tapes and rentals. Any suggestions?