This seems like a pretty bad design flaw - Rev 2 user here, issue is ever present and getting worse, scared of popping my eardrums whenever i turn down the volume.
And I dont think Firmware / cleaning is going to do to stop this from happening.
Look up the Stroboscopic Effect/Phenomenon - seems to be exactly what is happening with this.
Also, my mute button broke/depressed into the interface after normal usage, so now I can only mute in the software. Had the unit maybe a year. Not impressed.
Arturia plugins = A+
Arturia keyboards = A+
Arturia interface = F , will never buy again, disappointed I didnt go UAD at that price.