If just the titlebars disappear then that means you have indeed lost the
window manager. A basic image remains on screen because Xorg is still
running...

Please have a look in /var/crash for *.crash files. And then run ubuntu-
bug on each:

  ubuntu-bug /path/to/your.crash

That should create a new bug with traceable details about the crash(es).
We can't really do anything in this bug without such details.

** Changed in: gnome-shell (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1709994

Title:
  gnome-shell crashes often on unlock / resume from suspend

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