Since no one seem to read comments, I'll just write a new post. Since I switched to a new router, I noticed the problem is 100% gone on ALL of my office macs. I can also reproduce this by downloading music locally, disconnecting the network entirely and restart - then play music and there is NO crackling, not even after hours. This tells me that playing media over the network is what triggers the issue, so please try with a different NEW router.
I know it's only a temporary issue for travelers, but for offices it's a permanent fix.
Topic:
App & System Services
SubTopic:
Core OS
Tags: