Hello Borch2,
Let's use the steps in the following resource to see if you experience that same behavior while in safe mode: How to use safe mode on your Mac - Apple Support
It can take a few extra minutes to boot into safe mode. Your screen may flash or flicker while in safe mode. Those behaviors are expected. Testing in safe mode runs a check on your disk, removes some cached files, and can help isolate conflicts with startup items. Once you've tested that behavior in safe mode, you can restart to leave safe mode.
Let us know your results, and we'll keep moving forward from there.