Can you please check / post your journal (journalctl -b 0; remove any private information). I suspect this is a duplicate of bug #1792932 - i.e. X crashes when starting the live session and restarts successfully.
Can you please check / post your journal (journalctl -b 0; remove any private information). I suspect this is a duplicate of bug #1792932 - i.e. X crashes when starting the live session and restarts successfully.