Hi cookimonster,
Since widgets are unexpectedly quitting on your Mac, we recommend that you try the steps here: If an app freezes or quits unexpectedly on Mac - Apple Support
To perform the recommended troubleshooting steps via the link above, complete the steps in the section below.
* If an app doesn’t quit as expected, or it’s unresponsive, you can force quit the app (you may lose unsaved changes). Choose Apple menu
> Force Quit, select the app in the dialog that appears, then click Force Quit.
* If the app quit, reopen it by clicking Reopen in the dialog that appears.
* Restart your Mac by choosing Apple menu > Restart.
* Make sure the app is compatible with your version of macOS.
* Open another file in the app. There may be a problem with the original file.
* Check for updates to your software.
* Disconnect any peripheral devices you just connected (for example, a printer). They may not be compatible with your version of macOS.
* Uninstall any app plug-ins or enhancements from other manufacturers.
* If you recently updated the app or macOS, a plug-in or enhancement you installed may no longer be compatible.
* Diagnose problems on Mac to learn whether hardware you installed, such as additional memory, is incompatible, improperly installed, or defective.
If you’re still experiencing the same issue, then we suggest trying the steps in the link below.
Add and customize widgets on Mac - Apple Support
Please let us know the outcome after giving the above steps a try.
Thanks for using the Apple Support Communities.
Cheers!