It’s not failed, there’s a video on here somewhere that Reticulli posted; it’s the grounding. I had the same, you just take the base off and you’ll see 3 posts which the base screw go into. You need a piece of electrical flex joining each post to the next one, screw it back on, noise gone.
Edit - [COMMON ISSUE] Sound distortion, internal buzzing - #6 by j141