I am trying to transfer my VHS-c tapes to DVD. One tape initially worked for 2-3 min and then tracking seemed to go off until no video can be seen, audio continues. Now this VCR has the same problem with all tapes. I have replicated this with the same tape in two other VCRs. Now none can play back even a regular tape, its like the tracking is so far off, audio remains OK??? Any ideas? Thanks!!