The Aria Operations keeps showing the message "Communication Error: Timeout reached while trying to communicate with the server. Try refreshing the UI manually" on the UI. After refreshing the page, the message goes away for a short time and will then return again.
Aria Operations 8.x
This would normally be caused by temporary network issues that affects the stability of the cluster or general performance degradation.
Workaround: Reboot Aria Operations fully by taking the cluster offline and then rebooting Aria Operations VMs in vCenter.
Aria Operations fully reboot:
If the issue returns, open a case with support.