I'm not sure I fully understand your setup, but you have 2 monitors connected to the USB docking station? Only 1 of the 2 outputs of the docking station is designed to work at a time, as they connect to 1 DisplayLink chip in the dock.
Alternatively it could be the display settings when you connect the 3rd Display. Can you configure the monitor that has gone blank to be re-enabled in Windows Display Properties?
Wim
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