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It took some time to rewrite all the code from qcow files to LVM as it involved nearly every function. Now it is done and it prooves to be stable. To update to the newest Version 2.XX from 1.XX it is necessary to backup all VMs first, then to update to 2.XX via the recovery stick, then to convert the backups to the new backup format and then the backups can be played back to the new Hypervisor. 

NOTE: LVM is much more performant, so the update will not only bring more stability, it will also bosst the speed of the VMs. 

2017-02-05 Problem finaly reproducable!

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