Hi,
Please go through the following articles.
DWH***.tmp files are detected in the user profile temp directory
When new virus definitions are in place and the quarantine is being scanned, a DWH file is created and detected by Auto-Protect
How to Manage Quarantined files.
These detections do not indicate a new outbreak of a threat. The .tmp files are created by the Symantec Endpoint Protection (SEP) or Symantec AntiVirus (SAV) Quarantine scan. The scan is normally initiated by a virus definition update.
There are also several known methods to work around the issue:
The quarantine scan on virus definition update can be disabled in the Symantec Endpoint Protection Manager (SEPM): edit Antivirus and Antispyware policy > Windows Settings > Quarantine > General, under "When New Virus Definitions Arrive" choose "Do nothing".
Items in quarantine can be deleted.
If the indexing service is enabled it could be triggering the issue when the dwh***.tmp files are indexed.
Investigate other applications that are scanning the temp file for changes.
This issue is seen with few latest version of SEP i.e RU7 MP2
Check following article for more details.
https://www-secure.symantec.com/connect/forums/dwh...
Upgrade to the latest SEP version can be one of the possible solution.
I hope it helps.