Uhoh, I spotted this in your logs: [ 2699.988016] mce: [Hardware Error]: Machine check events logged
These are usually hardware errors and they may be able to cause instantaneous reboots. Install the mcelog package, if it isn't already, and details should be logged to /var/log/mcelog Thanks ** Information type changed from Private Security to Public -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1291134 Title: Opened X Diagnostic Settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1291134/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
