WSSBackup.exe - Service Terminated Unexpectedly

I've got a recurring issue where the WSSBackup.exe service terminates while backing up client computers. I've set the service to automatically restart upon failure, and it does restart. 

This occurs not on every backup, but I would say on about 30% of backups.  It does not seem to be any specific computers either, as when this happens the computer backup status will show 'incomplete'.  The next day the PC may backup correctly, but a few others will show the incomplete status.

When the service does crash, the errors below will appear.  I've patched the server to the latest versions.

Any ideas?

Application log:

Faulting application name: WSSBackup.exe, version: 6.3.9600.17088, time stamp: 0x533cc5ee

Faulting module name: WSSBackup.exe, version: 6.3.9600.17088, time stamp: 0x533cc5ee

Exception code: 0xc0000025

Fault offset: 0x000000000004e84c

Faulting process id: 0x1e90

Faulting application start time: 0x01cfb6feee000e29

Faulting application path: C:\Windows\System32\Essentials\WSSBackup.exe

Faulting module path: C:\Windows\System32\Essentials\WSSBackup.exe

Report Id: f1505f80-22f2-11e4-80ca-fc4dd4f53430

Faulting package full name:

Faulting package-relative application ID:

System log:

The Windows Server Essentials Computer Backup Service service terminated unexpectedly.  It has done this 1 time(s).  The following corrective action will be taken in 60000 milliseconds: Restart the service.