Server 2012 Hosting 2 VM's, backups fail

Greetings Experts!

•         We have Windows 2012 Server hosting 2 VMs - Domain Controller & RDS.  We have been doing Windows Server Backup incremental and have an ongoing issue with scheduled backups each night.  The backup shows completed with warnings and generates 2 log files.
The first log files shows:  
Backup of volume \\?\Volume{5d46f853-5db2-11e2-93e7-806e6f6e6963}\ succeeded.

Backup of volume C: succeeded.

Backup of volume F: succeeded.

Application backup
Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
   Component: ACBCD71E-A8CA-4672-B951-52C1BE8444BE
   Caption     : Backup Using Child Partition Snapshot\FMLRDS1
   Logical Path:

Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
   Component: Host Component
   Caption     : Host Component
   Logical Path:
The 2nd log file more often than not shows:  
Backup of volume E: has failed. Backup failed as shadow copy on source volume got deleted. This might caused by high write activity on the volume. Please retry the backup. If the issue persists consider increasing shadow copy storage using 'VSSADMIN Resize ShadowStorage' command.

Error in backup of E:\ during enumerate: Error [0x80070003] The system cannot find the path specified.
Application backup
Writer Id: {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}
   Component: 2B4A9541-C88B-442E-9A7A-6D8A27342C11
   Caption     : Backup Using Child Partition Snapshot\FMLDC1
   Logical Path:
   Error           : 8078010D
   Error Message   : Enumeration of the files failed.

   Detailed Error  : 80070003
   Detailed Error Message : (null)
We had been getting a successful backup once or twice a week which showed completed (with no mentioned of warnings) but now it regularly shows completed with warnings as noted above.  
We did a manual full backup of the DC to a different external drive a few days ago and that completed without warnings and the backup shows:  E: Completed 63.38 Full - VSS Copy Backup Successful, 8/27/13 3:35 PM - 4:43 PM. Data Transferred 63.38
On a side note, we can view the logs in the windows/logs/windowsserverbackup directory but when we attempt to view the details of a log file through the Local Backup Console for any log which shows completed with errors, we get a "MMC has detected an error in the snapin and will unload and then it shows Object referenced not set to instance of an object."  The manual backup noted above that was successful is able to be viewed through the Local Backup Console without this error.  
Any idea as to why this is failing during the scheduled backups?  This hosts a database that we need to have regular successful backups.
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IslandTomAuthor Commented:
We also tried removing the scheduled backup and recreating it and the result was the same.
IslandTomAuthor Commented:
We were able to resolve this by updating the storage controller drivers and updating the chipset drivers.

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IslandTomAuthor Commented:
Unfortunately, this worked for about a week and then it started to fail again with the same error and it has been hit and miss since then.   Once we found the time of the VM was off and corrected that and got a successful backup the following day.  The very next day, it was back to failing.  We continued to check the time and it has not been off again but the backups continue to fail on a regular basis.  Have not had a successful backup in a week now.  Anyone have any other ideas on what the problem might be?
IslandTomAuthor Commented:
The final resolution was adding an additional hard drive for VSS copies during backup.  Since we did that, the backups have been consistently successful.
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Windows Server 2012

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