SOLVED - *SOLUTION*
I also had this problem except my phone (Galaxy S24) would startup, allow me to unlock it, then whatever process would report crashed after maybe 20seconds, I click wait or force stop (it wouldnt matter which I clicked), the process would crash again after another 20seconds, then the phone would freeze and reboot itself. It continue doing this repeatedly, in a never-ending cycle/loop, so I had little time to try to backup anything, etc.
I tried booting my phone into Safe Mode (which I would have little time to do, so sometimes I couldnt if I werent fast enough - tip, you have to unlock your phone first then try to reboot into safe mode). The problem did not happen in Safe Mode, so it definitely had to be a problem with some app that was installed....even though I had installed nothing recently. There was a recent forced Andriod software update though...and some apps automatically update themselves in the background.
So I while in safe mode, I went into the Google Play, click on my profile in the top right, then click 'Manage Apps'.... then i sorted all apps by 'recently updated' and every app that had updated itself within the last 3 days (when my problem started) I removed those apps....or updated them. Then I restarted my phone. I got the process crash message one more time, then I rebooted again. And the problem has not returned since and I am using my phone normally again now! :-D
I also deleted old/unused apps, videos, and removed downloaded netflix videos and spotify music... because my phone was out of memory and this couldve cause the issue to begin with... so I freed up a lot of space.
I hope this helps you too. All the other solutions I found were much more destructive by causing data loss...or requiring a LOT more work (rooting etc).