Creating SNAPSHOT failed after 2 backups

Hi together,

i have a strange behaivor every third backup. The lxc container have round about 650GB (data).
2 snapshots and backups working fine, the third backup failed during the snapshot.
INFO: starting new backup job: vzdump 105 --quiet 1 --mode snapshot --mailto replaced --mailnotification always --storage pbs1
INFO: Starting Backup of VM 105 (lxc)
INFO: Backup started at 2021-06-04 02:15:02
INFO: status = running
INFO: CT Name: replaced01
INFO: including mount point rootfs ('/') in...

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