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Latitude E7440 display problems when using dock (external displays going black)


I'm using a Latitude E7440 with a Dock and two monitors connected to it. (Both with DVI)

Sporadically (often already shortly after starting the laptop) one or both of the monitors are going black for about 5 and come back after.

I already tried several things to fix the issue but haven't been able to find a solution yet.

What I've tried so far:

  • Update to latest BIOS
  • Use different display driver
  • Used a different dock
  • Mainboard replacement
  • Installed latest MST HUB FIrmware
  • Disabled Display Port in the monitor settings

At this point I don't know what else to do to fix this issue and I'd really appreciate any help from others.

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