If diag files are not generated anymore and file access crashes since the last VPS update, either revert to the last restore point before the update, or try systematically to find the problem.

I can't tell from here what it is, but I would run a thorough system diagnostic with disk check. Check also access rights. Look for locked files. Maybe reinstall Zorro in case the installation was damaged. If you want, you can subscribe a support ticket and let Support assist you and walk you through the steps. They also have a VPS installation service.

Don't continue trading on that VPS until the problem is found.