Track Audio - One side cutting out, or altogether.

Hi, thanks for replying, I’ve tried and it isn’t automation it’s a bug with the software. I know this because if I dupe the track or restart cubase, the audio comes back. Months down the line now after several re-installations and updates it’s also doing it when I export audio files, which makes producing music impossible. Have you heard of this issue before? It’s happening to my friend as well.