We had an issue earlier this month with the Win 10 App Readiness service (we're also on 1803) going crazy for an unknown reason. There are lots of articles out there with similar complaints and the solution for us was to disable the service. So far, we have not seen any negative impacts of doing so. It sounds like you're not able to get into a VM to see what app/service is spiking the CPU but wanted to mention it as a possible starting point.
I'll check that service but I've got a feeling it's disabled.
I forgot to add that I've applied the login.vsi template using the VMware optimisation tool.
We were running Horizon Agent 7.7 with Connection Server 7.4 for a longtime to address a bug.
Which version of VMware Tools are you running? I would recommend a uninstall of Horizon Agent/VMware Tools/any other VMware components. Then do a fresh install of the latest supported tools in the correct order.
I'll give that a try! We were leaning towards updating the agent again to see if it resolved.
We are running 10.1.15.
I had that issue as well on my 1809 image running the Horizon 7.6 agent...it ended up being a Group Policy that hide the Lock option from the CTL+ALT+DEL screen.
Seriously taxed my Google-Foo skills. And why does it cause a long black screen pause...? No idea. But it fixed it.
Just do a CTL+ALT+Insert on your VM and see if LOCK is missing!
If it's that, we can all laugh together...
So... just an update to this issue.
I installed Horizon 7.7 agent and recomposed the pools but unfortunately the issue still occurs. I can confirm there is no GPO to remove the Lock option on the lock screen,
We did manage to get the workstations responding again by restarting the VMwvvpsvc.exe service which I think it the Persona service. It's unbelievably frustrating.