No problem on working this out with you, as now it is becoming interesting how your system is not working like so many. Let's keep trying several things.
1) Use the Repair Filesystem tool not the Remove LV ...
Just create a NAS LV and then run it.
Or just go to the last step to try the Demo-CD route to rule out the USB module.
I have the message "WARNING: Some system settings will not be preserved! The system has started from read-only medium." so i think the USB DOM is not used.
I've filled my vg00 with 6 volumes iSCSI of 500GB, waiting for initializing.
Ok, so now this shutdown is not related to the USB or CD of the DSS software. IT has to be some hardware issue....... what about checking the RAM or CPU or if you can test with another system?