So my S24 Ultra is currently with Samsung as one of the camera modules (likely the 5x) started obviously rattling when moving the phone around.
Simple things like rotating the phone to landscape or lifting it to my ear I'd hear a very audible click. Moving around when recording video I'd hear it in the recording! The noise stops when activating the 5x so it's likely that module causing the issue.
Of course using the Samsung fault bot thing it says that it's normal for the handset to make noise when shaken, but mine is far beyond this. I've handled a few of them and none make any noise unless obviously shaking it like a mad man.
Still, it's a shame it's gone faulty. The other other phone I've ever had to wrong was also a Samsung. Was a good while ago, S4, I've not had a Samsung long term since (besides the Galaxy Nexus series).
With any luck it gets back to be soon, sorted, and not "no fault found" or similar!
May consider a Pixel 9 Pro XL Plus Mega Ultra when that comes out!