[opensuse-factory] Trouble with iSCSI over LVM and EXT4 mounted drive

I use a Netgear ReadyNAS 102 with actual FW-version 6.0.8 as iSCSI LUN. So with older Tumbleweed System/Kernels (daily updated) it works fine with to HDDs LUNs via iSCSI mounted to one LVM device formated with EXT4 as Backup destination. Since some weeks - I've some trouble with this drive. After a rsync or delete of a subrtee, it was remounted as read only. I've searched a while about possible reasons, but can't find it. I've also tested some different settings in the /etc/iscsi/iscsid.conf but no effect. Same error as anyone. All my LOGs and Settings you can find as ziped appendix on this mail. Ub22