I have those too but my sound isn't even looping. Are you using directional audio too by any chance? Because I noticed the issue doesn't appear with normal audio. It seems that specifically if the listener object is moving, the audio cracks like crazy. And I'd assume the player is moving a bunch. I tried different audiofiles too (mono/stereo wav, mp3 at different bitrates)
I've checked my files btw. and they seem clean at the beginning & end. I even added a fadein+fadeout to make sure but this doesn't fix the issue either.
Here's a file demonstrating this. Is this happening for other people too? It could also be some kind of driver issue. But if it's happening for a bunch of people, it's one for the issue tracker.
wackytoaster.at/parachute/cracklingaudio.c3p