Event 10172, Hyper-V-VMMS on backups for only two VM's (out of 6)

Hi All,

I'm receiving Catastrophic VSS failure when trying to backup Hyper-V VM. I have 6 VM's in total- 4 of them are using shared storage configured on the cluster.

Two VM's are using storage on the Physical Hyper-V hosts- those two are reporting Event 10172, Catastrophic failure (0x8000FFFF) when trying to backup.

Did anyone come accross similar scenario and will be able to advise?

Any help is much appreciated,

Cheers, Tomek