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-X, which is subscribed to xorg in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
