I have been having the same issue on my s22 plus, my calls cut off exactly at 14mins 28secs and I have been to my network provider and got a new sim. Nothing seems to have worked, some days my phone seems fine and some days it continues to cut off. Did you by any chance ever find a solution ?
I'm getting this now on my s10e. Calls hanging up after 14m 28s. It's making it impossible to phone any company with wait times. Have you found any solution?