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To trouble shoot further you can:

Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test.

This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.

Test issue in another user (or guest user) account  https://support.apple.com/en-us/HT204443

This will tell you if it a universal issue or isolated to your user/admin account. 

If you still need help sorting out the issue—

To get a good look at your System config. for conflicts or issues, you can run this utility http://etrecheck.com

If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the edit toolbar below.

guido131 wrote:

Thank you for your answer. I tried both ways but unfortunately the problem has yet to be solved. What could I try now?

Verify your software is up to date.

Boot into Recovery and reinstall the macOS on top of your existing macOS.

How to reinstall macOS from macOS Recovery: https://support.apple.com/en-us/HT204904