derekb
If you took the time to search forums on
delete squid cache
you will find many examples of issues similar to yours.
I looked already, but it's up to you to follow up & implement.
You possibly have multipe issues to resolve.
While you are at it, make sure you replace the UPS battery & configure Nut to shutdown the server gracefully when the battery starts to get low, ie to avoid uncontrolled power loss hassles in the future.