The Symantec Protection for Sharepoint Servers (SPSS) service is stopped following a scheduled scan.
No error is displayed on the screen, only the service stops. Once the service is stopped, this can cause file uploads to fail as well.
Please review the following Microsoft KB document for recommended local AV file exclusions. Please follow these recommendations as applicable to your environment.
Sharepoint Protection for Sharepoint installed on a server that is protected by a local AV scanner. For example Symantec Endpoint Protection.