I had almost the same issue with Dell D6000 docking,
Im using 2 external monitors , 4K monitor on HDMI + 2K on DP port + working fine for years, until few days ago, DP ports stopped working.
Tried a lot of things, read bunch of artickles, but no help.
In device manager, under 'Display Adapters' i had 2 question marks, and in device properties the device status was error 31.
I tried a lot of things, but at the end, i have uninstalled the newest displaylink driver 11.4.xxx from COntrol Panel -> add remove programs - and installed previous version 11.3.xxx and all started to work
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