I had the same question and I opened a Splunk case. This is the response:
"This is an error we have come across with some of our Windows customers, and seems more common of virtualized instances. The splunk process will periodically check the time of the OS system and will show this error if there is a difference (~15 ms) as an indication of the time progress internally. This is really an internal ERROR that should not be reported.
Reference: GetTickCount64 function https://docs.microsoft.com/en-gb/windows/win32/api/sysinfoapi/nf-sysinfoapi-gettickcount64
This issue is currently fixed in version 8.0.0, and if you would like to stop this error from occurring, you will need to look into upgrading to 8.0, otherwise, you can ignore this error message."
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