New Cubes and Linux user alert.
Looks like found a bug.
My laptop has LTE modem and was trying to setup it for sys-net. However Cubes does not recognize it and so no driver (if you know how can i securely install it, much apprechiate any comments).
So tried to add this device to sys-net and somehow sys-net also got setting to start qube automatically on boost. And with that unknown device added to sys-net, on boost after disk is unlocked, it freezes OS. Fixed it by disabling LTE in BIOS and then removed that device from sys-net.