- performance issues
A workaround exist while waiting for a fix:
- Open the policy properties
- Go to the Real-Time protection node
- Update the Enable behavior monitoring setting to No
If you could access to a session only through the safe mode, you could use the following command line on an elevated command line prompt:
reg add "HKLM\SOFTWARE\Policies\Microsoft\Microsoft Antimalware\Real-Time Protection" /f /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1"
[UPDATE] The 18.104.22.168 definition update seems to resolve the issue.