CMNCLNT TMP Files Not Clearing

I have a number of servers that do not have internet access, and I believe as a result the .tmp files in this location are not deleting:

C:\ProgramData\Symantec\Symantec Endpoint Protection\CurrentVersion\Data\CmnClnt

They are named like 00006279.tmp, 00010008.tmp, etc.

I have changed the settings in the External Communications Settings to remove the check box against Allow Insight lookups for threat detections, but this has not stopped the temp files piling up.