Dimming steppy with fixtures in 3.8.0?

Hey Guys,

just searched the forum but did not found anything actual.

Issue: On the weekend something like 40 Fixtures, 2 universes, on a festival stage, connected through artnet. The dimming, manually as in FX was very "steppy" means it looked more like a 4bit dimming rather than 8bit.
Fixtures were Mythos standard and B-Eye K10 easy standard.
Everything else like Movements, fades and FX (except Intensity FX) ran absolutely smooth, just the intensity things were weird.
Restart did not help..

I came across this a few weeks ago where this happened with a Quantum Spot Fixture, connected via DMX, but was not that steppy if i could remember right.

Setup is:
Nano with 8 universe
DELL AIO Touch
Hog 3 Wing
SW 3.8.0

Maybe somebody else encountered this?

All the best

Rolf