All voice mail rom either internal or external callers are off by 7 hours.
We are configured for PST.
It seems like CUE or CME may by the culprit.
The Ping tool may think a 4/5 success is fail. Not sure. But I do know that when you change the time zone on the CUE, it has to be reloaded.
But your 'show clock' was matching, so a little confusing. I wonder if you can do a maintenance window reload (after saving everything you have)?