Intermittent Popping/Knocking Noise

[Chad_Voegele]

Thanks for the lead on it being a fan issue!

I just noticed nrp’s response here

Fan hysterersis issue?

I commented on the other thread, but we’re adjusting the firmware to have the fan stay on for a minimum length of time to avoid the spin/up down cycling. The chirping noise is “pulse stretching” noise at fan startup, we believe. That one there is unfortunately no software fix for and we’re including improving that in the spec for the next fan hardware we kick off.

Perhaps this is the same noise and reason.