The Big Sur 11.2.1 update keeps restarting my computer, and then locking it up. Anybody else having this problem?

As @MyApple8MyPC mentions - it reconfiguring thing in background. If continues to loop - Force Shutdown by Power Button. Disconnect all external drives. Connect to charger and startup and immediately hold - Shift - key. This will boot in Safe Mode and do a Disk Repair, clear cache files and only load required Apple Software . . so loads slowly - Normal. If all goes well, this will allow the upgrade to finish and present the log in screen

Yes, Have the same problem and it is driving me nuts. Also, I cant get my email accounts and Imessege to sync with my phone . . .have tried everything. Have been apple only for 20 Years but seriously considering taking my company to Microsoft

I seemed to have no problem updating to 11.2.1 on my new Mac mini M1, until getting a panic "mvme_ppl: ..." the next morning while the new computer was sitting alone idle. It ran normally the rest of day, and before ending my day, I booted into safe mode for less than ten minutes. Later, I noticed from "About This Mac/System Report/Installations/" that macOS 11.2.1 was reported to have been installed late in the evening when I did the safe boot exercise. (Not in early morning when the install was actually done, and during that day, the high level "About This Mac" was indicating that I was running 11.2.1.)

It seems possible that the install was not fully completed, even though outward appearance would indicate otherwise (except for the panic shutdown).

I have been running very nicely for almost two days since the normal boot after trying the safe mode.

It has been mentioned on other threads that booting into safe mode for a few minutes may repair some issues; seems prudent to try if you have any issues with this update.

The details of both the panic and the curious install time of the macOS update have been reported to Apple.

It's reconfiguring when it restarts. This is normal on first boot.

If it won't complete to the desktop then you'll need to reinstall, or use your backup to go to the previous OS.

Great and pleasure assisting.

Well, spoke to soon. It will start up in Safe mode but not through a normal restart.

Nathing