I have had my Acer Swift 3 (running Windows 10) for about 6 weeks now.
Two days ago, I was using a website with audio playback (my laptop was running for about 4 hours at this point), and the audio playback from the speakers began crackling/reverb. It continued for approximately 30-45 minutes before fixing itself. I tested other websites, I also tested audio within Windows 10 (external of the browser), and the problem seems to be global to the device itself (or maybe an issue with the audio driver, which I checked and it is currently running the latest audio driver).
This has happened at least 2 or 3 times now. One of those times, I restarted the computer, and that seemed to have fixed the problem.
I recorded two videos to document the problem: