Symptoms: CPU usage will spike to 100% and will be mostly used by the service "Azure AD Connect Health Sync Monitoring Service". Cause: .Net framework update before the software fully supports the underlying update. Workaround: stopping the service will temporarily resolve the issue until the service restarts or the machine is restarted. Fix is available from: https://www.microsoft.com/en-us/download/details.aspx?id=47594 --- [[Epistemic status|Colophon: Overbrewed]]