Error: V-79-57344-65233

Hello,

i have a Problem with BackUp Exec 15 at a customer.

Errorcode: 

V-79-57344-65233 

We have 2 Servers that are Backup.

The remote Server is runnung well.

The local server runs well for two days, then the error occurs.

After the BackUp fails, this are the status of the VSS writers.

With an reboot oder with an restart of the various services the next back up is successfull.
But it is an Question of time, when the next BackUp fails. 

Windows Server 2008 R2.
BackUp Exex is on the latest Version.

Does anyone know the Problem?