I did some testing with the equalizer bars and crafting while facing away from the camera, which fairly reliably produces the audio stuttering. I've posted my results in my bug thread
here.
I've also been reading through the bug reports posted on these forums. Someone said a few pages ago they knew someone with a Phenom CPU had no stuttering issues, and speculated that Phenom CPUs wouldn't cause this problem - however,
this bug report indicates a user with a Phenom CPU is having the stuttering bug. So now we're up to FX, Ryzen, Phenom, and i7 CPUs having this problem, as well as (anecdotally) consoles - however this last only comes from something a forum poster reported reading in shout chat. If we could get someone on the forum with a PS4 or PS5 to confirm they have the stuttering bug, this would be a great help.
It's entirely possible that one source of the problem is something that happens with the CPU, but if it's happening with every type of CPU, then just getting a new CPU isn't going to fix the problem.