I understand the frustration with how random the issue is, I've been
there before. I can only recommend:

* Avoid docks if you need to drive high bandwidth displays.
* Have other brands of cables on hand to try. Including a direct USB-C to 
DisplayPort cable.
* Try fewer monitors.

You should be able to test things slowly:

1. Laptop works perfectly by itself with nothing connected.
2. Laptop works perfectly with one monitor directly connected.
3. And so on. Stop when things stop working reliably and go back to retest the 
previous setup.

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https://bugs.launchpad.net/bugs/2106371

Title:
  32:9 resolution missing

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