I have a single ZCM 11 Linux primary server appliance that was setup several months ago. Until recently, clients have been able to log into the server just fine. But over the past few weeks users cannot login the server is a virtual appliance running on VMware and there have been no changes to the environment that I can tell. But if I restart the server from the console, it will start letting users login again for a little while. Looking at the VM, the CPU usage pegs out for a bit even in low use times. After I restart the server, the users can then login again until the CPU maxes out again which has been about twice per day and no regular interval.

What do I need to to do troubleshoot this?