I'm here with the same exact issue. As the song's playing back, the video slowly starts falling out of sync and I have to stop and restart it for it to catch up again. The metronome and claps are still perfectly lining up with the song, but what I'm actually looking at is kind of moving faster than the audio is (I'm seeing the notes hit earlier than I'm hearing them.) My computer rig is definitely on the higher-end side, and I'm not noticing any stuttering, but it might be on a really micro-scale anyway so I'm not sure if that matters. (I have a habit of leaving bandicam up, it's constantly at 100 during playback. Not really accurate but it should give me an idea if there's stuttering going on I guess? I wouldn't know.) It's annoying when I'm looking over the note-tracking and want to get a little runthrough of the song before I export it to have to keep stopping and starting (especially when some of the songs are pushing ten minutes.) I've tried turning on and off Vsync in the settings thinking that might be an issue, but doesn't seem to help. I'll keep experimenting but if anyone comes across something that might help, feel free to share. I don't think I always had this issue either on this rig. I upgraded to a 144hz monitor in the past, wondering if that might have anything to do with it.