Hi Jopi,
Thanks for providing the information.
Can you please try re-install the DirSync tool with the password sync feature disabled, then check if the issue persists?
Also, to protect your privacy, I have sent you a private message to request the error event logs. Please try the following steps to access the message and provide the information requested in the private message:
• Go to the Your details section on the right side of the community site.
• Click Private messages.
• Click the subject title of the response to read the message.
• You can reply by using the form that displayed.
• Click Submit Reply.