Need some help trying to troubleshoot this new issue that cropped up on my

Need some help trying to troubleshoot this new issue that cropped up on my month old K40 laser cutter.

Instead of attempting to describe the buzzing noise, I uploaded a YouTube video that hopefully will make it easy to troubleshoot this issue. Input, experiences and suggestions much appreciated.
https://www.youtube.com/watch?v=98uoWVvYAjo