Clips randomly disappearing from timeline
I have a 30 minute timeline with 1000s of clips (20% HD, 75% 4k and about 5% 8k). It's graded and almost complete. As usual, after alterations I saved and rendered. Then I found some clips of video and some of audio just disappeared from the timeline. I repaired them and rendered, which was fine.
I carried on editing but found that lots of clips are now not playing at all. The preview is there but the clip plays nothing (there's also a gap in the green line). If I dbl click on the clip I see it is there in the bin and can play it from there. This is catastrophic, as the timeline is peppered with holes, even if I repair them how do I know more won't appear?
Mac 10.14.6 running PP 14.3.1. I'd really appreciate an expert view, many thanks. Paul
