Maybe it's just coincidence but after turning on the "reduce transparency and blur" option in the settings I've stopped getting random restarts, my phone generally performed better, and I've gotten better battery life. It looks like Samsung has some work to do to optimize the new blur and transparency effects.
I don't understand why Samsung likes the hideous backgrounds so much, but I guess they're trying to pander to Microsoft (Windows 11) since they're such good buddies. I'm so glad there's an option to turn them off.
To be honest with you, toggling blur off and changing screen refresh rate to standard (60hz) has fixed 99.9% of my beta problems. I thought I would notice the 60hz but the beta is so buggy in that area that I got used to it in 30 minutes. The phone runs smoother. Everything works as I assume they expect it to.