Comment 1 for bug 1728383

Same thing has happened to me. It was preceded by my session crashing and this being logged.

"gnome-terminal-[2466]: Error reading events from display: Broken pipe
 update-notifier[2408]: Error reading events from display: Broken pipe
 indicator-cpufr[1937]: Error reading events from display: Broken pipe
 telepathy-indic[2052]: Error reading events from display: Broken pipe
 systemd[1513]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE
 systemd[1513]: gnome-terminal-server.service: Unit entered failed state.
 systemd[1513]: gnome-terminal-server.service: Failed with result 'exit-code'.
 org.gnome.Shell.desktop[1638]: (EE)
 org.gnome.Shell.desktop[1638]: Fatal server error:
 org.gnome.Shell.desktop[1638]: (EE) failed to read Wayland events: Connection reset by peer
"