How can we improve WHMCS?

Hello

We noticed that the cron fails if there is Old server in Setup > Servers
that is no longer available .

We checked activity log: Utilities >> Logs >> Activity Log and it
appears that the main cron is not completing and stopping during the Automated Task: Starting Server Usage Stats process

The most likely cause of this
error is that we had an old server in Setup > Servers that is no longer
available.

To resolve this, you should
update or remove any inactive or offline servers from Setup > Servers so
that they can all be connected to successfully.

Or alternatively Update Usage
Statistics can be disabled under Setup > Automation Settings.