I'm having the same issue. It was happening with 4.4.24 and then I tried this workaround:
https://displaylink.org/forum/showpo...6&postcount=19
This seemed to work for a while until a couple of days ago when the issue started to recur. I upgraded to 5.2.14 but the issue persists.
Kernel 4.15.0-65-generic, Ubuntu 18.04.3 LTS
Dell Latitude 5580, Dell D6000 dock connected via USB-C