Backup failed error 61

[Frigg]

Hello,
Since yesterday, though VM 120 works fine, when I try to backup it, I get error 61. Others VM can be backuped normally.
Message is:
INFO: 33% (264.1 GiB of 800.0 GiB) in 19m 18s, read: 289.1 MiB/s, write: 258.3 MiB/s
INFO: 34% (272.0 GiB of 800.0 GiB) in 20m 28s, read: 116.6 MiB/s, write: 116.5 MiB/s
INFO: 34% (274.1 GiB of 800.0 GiB) in 20m 35s, read: 306.5 MiB/s, write: 179.6 MiB/s
ERROR: job failed with err -61 - No data available
INFO: aborting backup job
INFO: stopping kvm after backup task
trying to acquire lock...
OK
ERROR: Backup of VM 120 failed - job failed with err -61 - No data available
INFO: Failed at 2021-05-22 11:47:56
INFO: Backup job finished with errors
TASK ERROR: job errors

How can I get ride of this issue ?

Thanks for helping
Hervé

 

[Frigg]

... just a PVE restart, and all goes right now.