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
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[[Epistemic status|Colophon: Overbrewed]]