Sounds like you might have multiple bugs.
(1) Failure to remember the correct display configuration when logging
in is bug 1726538.
(2) If your session is getting terminated then something is crashing.
Please forgive the standard response...
Thank you for taking the time to report this bug and helping to make
Ubuntu better. However, your crash report is either missing or
challenging to deal with as a ".crash" file. Please follow these
instructions to have apport report a new bug about your crash that can
be dealt with by the automatic retracer.
If you are running the Ubuntu Stable Release you might need to enable
apport in /etc/default/apport and restart.
Now open your file manager, navigate to your /var/crash directory and open the
crash report you wish to submit.
If this fails you will have to open a terminal and file your report with
'ubuntu-bug /var/crash/_my_crash_report.crash' where _my_crash_report.crash is
the crash you would like to report. If you get an error that you aren't allowed
to access this report you will have to file it with 'sudo ubuntu-bug
/var/crash/_my_crash_report.crash'.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1729441
Title:
changing display mode after login terminates session
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1729441/+subscriptions
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