So, I'm probably tempting fate here but I might have stumbled across a fix documented at the Arch Linux wiki page for DisplayLink.
https://wiki.archlinux.org/index.php/DisplayLink
Scroll down to this section of that page "USB 3.0 DL-6xxx, DL-5xxx, DL-41xx, DL-3xxx Devices" and add the
Code:
/usr/share/X11/xorg.conf.d/20-evdidevice.conf
file and add these lines:
Code:
Section "OutputClass"
Identifier "DisplayLink"
MatchDriver "evdi"
Driver "modesetting"
Option "AccelMethod" "none"
EndSection
So far, my Spectre x360 with a Dell D6000 dock has been stable in a multi-screen setup overnight whereas it would "forget" the displays in less than 15 minutes.
I'll continue testing - I hope this helps others.