Backups failing due to VSS errors

20 pts.
Tags:
Backup
Syncsort
VSS
Windows Server 2003
On a Windows Server 2003 standard SP2 virtual machine, set up for 3rd party (Syncsort) backup to run daily. this has been running for a while, but now every single one fails. If I go to event Viewer I get:

EventID:12289

Volume Shadow Copy Service error: Unexpected error DeviceIoControl(?Volume{a5511180-7eba-11d8-bdbf-806e6f6e6963} - 00000198,0x0053c00c,000377C0,0,000387C8,4096,[0]). hr = 0x80070057. 


Also in the event viewer throughout the day are other VSS related errors:

EventID: 7001

VssAdmin: Unable to create a shadow copy: Another shadow copy creation is already in progress. Please wait a few moments and try again. Command-line: 'C:WINDOWSsystem32vssadmin.exe Create Shadow /AutoRetry=5 /For=?Volume{a5511181-7eba-11d8-bdbf-806e6f6e6963}'.

EventID:12298

Volume Shadow Copy Service error: The I/O writes cannot be held during the shadow copy creation period on volume ?Volume{a5511180-7eba-11d8-bdbf-806e6f6e6963}. The volume index in the shadow copy set is 0. Error details: Open[0x00000000], Flush[0x00000000], Release[0x80042314], OnRun[0x00000000]

EventID: 12310

Volume Shadow Copy Service error: The shadow copy could not be committed - operation timed out. Error context: DeviceIoControl(?Volume{a5511180-7eba-11d8-bdbf-806e6f6e6963} - 00000198,0x0053c010,000377C0,0,000387C8,4096,[0]).


Now, I have had similar issues with servers before and have always found a lot of suggested fixes online, but never a definitive solution. Sometimes certain things people suggest work, other times nothing they suggest will work and we only manage to fix the issue by fluke after uninstalling software, resetting backups etc. For the issue I am experiencing now I have found out there is a hotfix available which I have downloaded and will install soon. As always I am not fully confident that this will solve the problem. Can anyone provide any more information on what causes these errors; why shadow copies will work for months without a hitch and suddenly start playing up when nothing at all has been changed on the system?

Software/Hardware used:
Win 2003 Standard Sp2. Virtual Server

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