Azure Active Directory Connect, High CPU Usage After June 2018 Patching

I did the latest Microsoft security updates for some servers, and was noticing my server running Azure Active Directory Connect for Office 365 was running at very high CPU.  I wasn't successful at restarting it from within the guest (or, wasn't patient enough, take your pick) and reset the VM.  The issue persisted.

My Microsoft.Identity.Health.AadSync.MonitoringAgent.Startup.exe was running at 99%.

Some research quickly tipped me off to the culprit.  (https://social.msdn.microsoft.com/Forums/azure/en-US/e9b621f6-f38c-488e-8fcb-ff85d406f256/azure-ad-connect-health-sync-monitor-high-cpu-usage?forum=WindowsAzureAD) .NET Framework 4.7.2 was the culprit.  Uninstalling the right KB depends on your OS.

• Server 2008 R2 - "Microsoft .NET Framework 4.7.2"
• Server 2012 - KB4054542
• Server 2012 R2 - KB4054566
• Server 2016 - KB4054590

I was dealing with Server 2016, so I uninstalled KB4054590, restarted, and the server seems fine.

My Azure Active Directory Connect is current at 1.1.819.0, released 5/14/2018.  (https://social.msdn.microsoft.com/Forums/azure/en-US/e9b621f6-f38c-488e-8fcb-ff85d406f256/azure-ad-connect-health-sync-monitor-high-cpu-usage?forum=WindowsAzureAD)

I'll be sure to monitor the version history to see if when I go to patch next month, if Azure Active Directory Connect has been updated to address this.

Resolving Crashing Skype for Business

Today, I found myself unable to open Skype for Business.  I would load the application and it would crash.

Examining my Event Viewer, I found the following:

Level: Error
Source: Application Error
Event ID: 1000
Faulting application name: lync.exe, version: 16.0.4690.1000, time stamp: 0x5acd052e
Faulting module name: KERNELBASE.dll, version: 10.0.15063.1029, time stamp: 0x99b50546
Exception code: 0xc06d007e
Fault offset: 0x000f0132
Faulting process id: 0x3364
Faulting application start time: 0x01d40178ed74b119
Faulting application path: C:\Program Files (x86)\Microsoft Office\Office16\lync.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: fde33f51-913a-4302-9674-3a5370420999
Faulting package full name: 
Faulting package-relative application ID: 

I was a bit perplexed as I had run successfully last week after receiving updates.

I found the resolution here (thanks to Brian):
https://community.spiceworks.com/topic/2126287-skype-for-business-2016-problems-after-kb4018323

• Open your Playback devices menu by right-clicking on the volume icon on your taskbar (or your preferred method)
• Highlight your current playback device and select the Properties button.
• Select the Advanced tab on the resulting window.
• Under the heading ,"Exclusive Mode", ensure that both checkboxes are unchecked. Really, you can deselect the first checkbox and it will gray out the second for you.