You need to prevent the Auto-Protect component of Symantec Antivirus for Linux (SAVFL) from scanning files as they are read.
Symantec recommends leaving the Auto-Protect scan settings for SAVFL at the defaults to provide the highest level of security. The following procedure will lower the security level of your computer as the Auto-Protect component will no longer scan files as they are read, but will still allow files to be scanned when executed, or created/modified. This can prevent some applications which frequently access many large and/or compressed files from failing.
Confirming the settings
Run the following command:
confirm the output of the command contains a lower-case "rd" flag instead of an upper-case "RD" flag. For example:
Additional information on exclusions can be found in the Connect forum article SAV for Linux Scanning Best Practices: A (Somewhat) Illustrated Guide