Horizon Client Freezes for 3-5 Seconds Randomly

Hello Everyone,

I have been chasing a ghost in my VDI environment for a while now with no success. All of our VDI users (myself included) experience a weird freezing event with our desktops that will happen randomly. The desktop could go days without a freeze, and then do it 3 times in the same day. When the desktop does freeze, I can still move the mouse around but I can not click on anything. Once the desktop unfreezes, it registers all the move clicks and button presses that occurred while it was frozen and performs them all at once. It is very similar to the way a PC acts when its memory is over consumed.

Here are my troubleshooting steps so far:

1. Since I am able to move the mouse around, that led me to believe it was a problem with the client so I had my users write down the time when the machine froze. With those times, I scanned through all the VDM logs on the physical PC for any logged event at those times. I could not find anything. I even checked the agent logs during those time periods and still found nothing logged.
2. I called VMware support and had a tech remote into my system. I gave him the time periods of the freeze events that occurred that day and he could not find anything in the logs. He also checked the Connection server for PCOIP drops but could not find anything. I was informed that there was no evidence to declare the problem VMware related.
3. I installed and configured vRealize for Horizon and monitored PCOIP traffic and bandwidth. Both look good. I noticed that vRealize is claiming that the VDI desktops are over consuming memory. they are running on 4GB and claim they are using all 4GB. However, task manager on the VM's themselves report that average consumption is 2GB. (This may be unrelated but thought I would mention it)
4. Thinking that the VM's needed more processors and memory, I upgraded the VM's to 5GB ram and 4vcpu's (which is over kill for our usage). 4 hours after the recompose with new hardware specs, I experienced another freeze. I immediately looked at the memory usage trace I had running for this machine and it was holding steady at 2GB.

We are using the latest of everything for software. 5.5 for hosts, vcenter and vsphere. Also running Horizon with view 6.0.1.

Any ideas in figuring this out would be greatly appreciated!