Unable to communicate with ZESService Error.

Hello All

Not sure why, by several workstations seem to get this warning message daily. I do not use Endpoint protection at the moment (still in the migration phase from ZDM 7)

Any idea's on how it can be resolved? here is the exact message.

Full Message:
Unable to communicate with ZESService. Please make sure that ZES Service is running.

Additional Information:
Status returned Non-Zero value from ZESM Core function : "ClearUserZESMPolicies[Refresh]".

It does not seem to be occurring at any specific time, and not all devices are impacted.

Thanks