Same for me. I'm a relative newbie and I was reluctant to dive into a new board when everything once seemed to work fine circa Cura 3.8, I think. The stuttering issue seem to come out of nowhere and I figured there had to be a simple solution if I scoured the web, but there wasn't much out there. The new board was kind of an afterthought, actually, after I pretty much gave up and slowed my printing down to a crawl. Also I had ringing issues, typical for a CR-s5, but again, not much info was available on that. The new CR-s's have a z-brace, and yes, a new board. The operation is incredibly smooth and quiet with the new board on mine. Had I known, could've saved a lot of trial and error.