I had a similar problem:

- i was in my regular user and did a suspend in the laptop
- someone turn on my laptop, and the system went to lightdm, then the person 
choose Guest Account
- some time after, the Guest was suddenly logged out

Then after, i tried to login to Guest, and shortly after it logged out.
I logged in to my user, and changed the tty, and i realized that there
was 3 locked tty.

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https://bugs.launchpad.net/bugs/1291454

Title:
  spontaneously logged out of lightdm session, authentication failed
  until logind restarted

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