Iphone 11 freezing and restarting

My iphone 11 has been freezing and restarting by itself multiple times a day (when I say multiple, I mean 2-3 times in a hour) and it has been driving me crazy. It freezes whether I’m using it or not. My phone never gave me any problems, but it started after the ios 16.0.2 update. I updated it to ios 16.2 recently but it’s still freezing. I spoke with apple support and they did a diagnostic test and said everything is fine with my iphone. Now idk if I should just buy another phone since this one is driving me nuts.