Thanks for posting, and sorry to hear about the issues you’re having with displays blanking out. suspect that these issues are hardware/connection level, and that our best chance for resolution lies somewhere in how the devices are connected.
Can you please share some details about how the USB graphics adapters are connected to the PC- via a USB hub, directly to the PC, any USB extensions, etc? Eliminating any hubs and extensions and connecting directly can help isolate a hub or extension that is failing. It’s fairly common for these sorts of issues to result from a USB hub with insufficient power for all the devices connected.
If changing your connections about isn’t making a difference, please send a mail to email@example.com, attention Jeff, with the output from the DisplayLink support tool.
Again, thanks for posting and best wishes-
MCITP Enterprise Support Tech