Backup of SQL 2008 R2 with VSS snapshots

I got a third party software (Evault) that use VSS to create fullbackup. 

Sometimes fullbackups fails on one job with alot of changes during fullbackup.

The shadow copies of volume D: were deleted because the shadow copy storage could not grow in time.  Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied.

volsnap event id 25.

 I have change the setting:

 MinDiffAreaFileSize to 3000. 

Something more I could do? Local disk is all SSD. Server is running Windows 2008 R2/SQL 2008 R2 Enterprise.

Magnus