SOLUTION TO THE PROBLEM:
i spoke to a friend who had the very same issue.
Over time a lot of dust and
especially skin-particles from your fingers will fall into the spaces between Wheel and audiofuse case.
if you remove the wheelknob you will see there is no real shielding at all (i only can speak about the AF Rev.1, very poor hardware design)
i assume thats the reason why the sensors get irritated and it results in those volume spikes while moving the wheel
what you wanna do: Remove the Wheel, clean the inner wheel with a Cotton swab and alot of Isopropanol 99%
WARNING: Don´t use any other Cleaner, no contact-cleaner, no fancy electronic cleaning sprays or other stuff.
Don´t use isopropanol 60% oder lower. Most of the cleaners have other liquids and / or worse parts of water in it, that will
destroy the electronics over time with cororsion.
Only use the the real deal with 99% - u can use a lot, it will not harm your components.
We testet it on both AFs and they are running like new, without any problems...