Cubase 10.5.5 - Same crashes and GUI lag as previous version

Hey folks,

same frequent crashes and GUI lag as in the intial 10.5 version. Wasn’t this update supposed to fix it?? No reply from support whatsoever…
Sometimes the entire OS is freezing, need to press the power button for hard shut down.
No issues like this on 10.0.5. All problems kinda started with 10.5 …