As soon as the head cleaner is inserted in the VCR, the unit shuts down. I've also noticed recently that a few of my VHS tapes from 1989-'90 have garbled audio for the first 30 minutes or so even though the picture is fine, which is why I figured I should clean the heads. The head cleaner has worked fine before (I bought it in early 2016, and I bought the VCR-DVD player in early 2014), and the audio on the tapes in question was also fine until recently. Thank you for any help you can provide.