I recently began converting my old collection of Hi8 tapes to digital using a Canopus ADVC-300. As for my camera, I'm using an old Sharp, model number VL-H860. So far, I've been pleased with the quality that the ADVC-300 provides. However, I have noticed that occasionally, there will be momentary horizontal jitters that flash onto the screen. These jitters last only a fraction of a second, and usually appear towards the middle of the screen (although I think I've seen them other places). I don't think it's a problem with the tape, because when I rewind it, the jitter does not occur in the same spot. I also thought that perhaps the Hi8 heads were dirty, so I purchased a dry Dynex cleaning cassette from Best Buy and have run that through multiple times. So far, the occasional jitter still appears. As you can imagine, I'm trying to convert these tapes at the highest quality possible (hence my splurge on the ADVC-300), and would like to preserve these memories without the occasional horizontal lines. Does anyone know what these are from and what causes them? I'll try to take a screenshot from iMovie and post it later. Any help would be greatly appreciated. Thanks.