It might be the systemd OOM killer. You can see the journalctl output for your
current boot with "journalctl -b 0", the previous boot with "journalctl -b -1",
etc. Get the output for whichever boot the logout happened in and grep for the
word "pressure". I had a similar problem with non-DE logins (
https://bugzilla.redhat.com/show_bug.cgi?id=2177722 ) but that was fixed with
recent systemd updates. When it happened to me I saw a line like "Killed
/user.slice/user-0.slice/session-1.scope due to memory pressure for
/user.slice/user-0.slice being 67.40% > 50.00% for > 30s with reclaim activity".
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