I have a modern computer with a fast processor. Wonder why the sound cuts in/out on playback. see http://wildirisconsulting.com/dorico/IMG_3144.MOV
Have you checked this video: https://www.youtube.com/watch?v=5BcPJd92zqU
I have the same problem from time to time. I also have a fast computer and processor, but a crappy built-in audio engine. You might be in the same boat.
Try increasing your buffer.
If you’re running Mac the issue may be related to this known problem: https://ask.audio/articles/is-apples-t2-chip-ruining-music-producers-recordings