I had a Note9 and noticed that when I was on a oone call the audio would randomly go out for a few seconds with almost every call. I had other problems and decided to upgrade, hoping a new phone would remedy all issues.
However, the problem persists with my new S24 Ultra. I am on the speaker phone talking and the audio just goes out. It does this a few times with almost every call.
Sounds like you're being plagued by a third-party application - especially if you pulled everything over from your previous device. My recommendation is to try your phone in safe mode to see if these symptoms persist, if they don't then start removing any third-party applications starting with the latest one added until the symptoms disappear.
