I found that some of my issues were solved by going into Utilities → Platter Touch Sensitivity → Calibrate. I was noticing that the left platter wasn’t changing color when I pressed on it, and recalibrating fixed that. Apparently the platter thought it was being pressed down, hence stopping playback. That still doesn’t explain how pressing & holding the “Next Track” button would make that same track continue playing.
I was having the same issue scratching too. This whole thread also talks about jog wheel issues, and this comment specifically about scratching: Denon prime 4 left jog wheel issues - #16 by dave-b