VSR 21 backup failure every 4-5 Days

[CQ]

Hi,

Several weeks ago, we installed VSR 21 SP2 on a new Win 10 Pro 20H2 PC  The PC has one 256 GB SSD NVMe.  Last week we upgraded VSR to VSR 21 SP3 which supports Win 10 20H2.  We run a VSR job daily on this machine with new recovery points created twice a month.  Since the original install weeks ago backups fail approx. every 4-5 days withe following errors:

"Error EC8F1780: Cannot successfully reconcile changes since last session.

                Error EC8F1771: Cannot enumerate the current drives on this system.

                                Error E0050001:  (UMI:V-281-3215-6016)"

We were hoping the upgrade to VSR 21 SP3 would resolve the issue, but it made no difference. The error continues daily until the machine is rebooted and then backups run successfully again for 4-5 days.  We have uninstalled/reinstalled VSR a couple of times with no change in the error pattern. For many months, we have VSR 21 installed on several other Win 10 Pro computers and we have not experienced this error on any of them.

Any help is appreciated.

CQ

[akihiro1]

Did you connect USB devices? 
I have never seen this symptom. Especially it is strange that the issue happens every 4-5 days.

Please open a support case if you have a support contract.

[akihiro1]

A workaround I suggest is as follows.
 
Please change the start type of "Virtual Disk" service from manual to Auto, and reboot the machine.