I already opened a support case about this before (Case #08202633), but I closed it because I thought it was a one-time problem. The emails stopped for several days after that. But now the problem is back.
Since updating to Veeam Backup & Replication 13.1.1.18, we've been getting emails from the "Software Update Summary" with an error, across several customer installations.
The strange part: it runs completely fine for several days (Status "Success", Sync "Success"), and then suddenly on one day it flips to "Error", sometimes at multiple customers at the same time. The days later it goes back to working normally without any changes on our end.


What we've already ruled out:
Firewall/network: Can't be the cause, since the connection works fine on other days.
Reboots: No server reboots occur at 22:00 (the job's scheduled time) on the affected days that could interrupt the Updater service.
Has anyone else observed this since 13.1?
Is this a known issue/bug in 13.1.1.18?
Does anyone have an idea what might be causing it?
Thanks in advance for your help!