Same issue here on the S20. Please fix @Samsung. This is unacceptable. Paid €800 for a brand new phone not even a month ago... and now this. Tried just about everything. Nothing seems to help.
Same problem here with my s20 ultra, resets and updates don't seem to work. A phone this expensive shouldn't have these issues..
I just spoke with Samsung customer service on the phone. They told me to launch the phone in safe mode and restart. This would temporarily disable all third party apps and possibly solve the issue. It seems this did the trick for me. No stutters, so far. Hope this solution holds and the issue doesn't reappear. I did have to re-activate email sync, so be sure to check vital settings afterwards.
How to boot in safe mode: https://www.samsung.com/us/support/answer/ANS00062983/
Good luck. Let us know how it goes!
Well it was fun while it lasted. The problem came back. So booting in safe mode is only a temporary fix. Samsung customer service tells me the only option remaining is to factory reset the phone. If that does nog fix the problem, I will have to bring the phone to one of their service centers for inspection.
Factory reset seems to have solved the issue, for now. Will come back to update in case the stutter returns.