Hi Gary1,
We have opened a hosting support ticket on our hosting portal where you can reply with more details (our hosting team does not have administration access to your Joomla site so cannot directly try to reproduce the issue to check the logs).
So best is to try to reproduce the error and write down the exact time (with timezone), your public IP address from which you access your site (
whatismyip.org/
gives you that information) and provide that information in your hosting ticket, together with the date-time and timezone of your access.
You also have access to your Apache error logs which might give you precious information in your hosting panel in "Logs and Reports" - "Apache Error Logs".
Btw. To get fast support from our hosting team, best is to open a hosting ticket on our hosting portal, that way we can directly link to your hosting account.
Our hosting team already looked into the error logs, but couldn't find the faulty access with certitude. So best is to follow-up from here on the hosting ticket regarding this issue.