Recently we are facing touch response issues after september security path update. Here are some suggestions to get rectify, this may help you some what for time being.
1) Goto Samsung Keyboard settings - Select Swipe, Touch and Feedback option - Keyboard, touch and hold delay òption ‐ select customs and keep for 0.10 seconds
2) Goto accessibility - select interaction & dexterity - select touch and hold delay - customs - 0.24 secoñds
Please try these and give feedback or likes for better postings in future.
Can you try disable battery optimization for system ui app and check ... I have just came across this as solution for some other phone and checking if it works for us also..
