Also check for software updates. The S23U have a software update that helps with the S-pen issues. It should be available in the galaxy store. Or you could go to your S-pen screen in advance features>>>S-pen>>>> scroll to the bottom>>>> about S-pen. Then should tell you if you have any updates available.
Had this issue from day 1. Preordered the phone and complained to samsung immediately. None of the suggestions online helped.. the first few CSR just blew me off. Then after the 4th they finally said they'd send me a replacement. Waiting for it still. 1month later. Am so disappointed as I've been a loyal samsung fan for years, since s6. And bought this phone just for the pen. Which I now learnt to ignore. And am not using it. Also their customer service went down in quality.
