Thank you for the help. My XPS 13-9380 shipped with Windows 10, but I set it to dual boot Ubuntu 19.04. I have BIOS 1.5 installed and all the updates, but still experience this Thunderbolt/USB-C failure. Unplugging all connectors and rebooting after a brief (1-2 min) break has thus far brought back my port. This is only a temporary work around though and I'd love to have a proper driver update to solve this.
* Click my DELL-name and private message me the PC service tag number
* Do you have the issue when running the Dell supported Windows 10?
* Did you have the issue when running the Dell supported Ubuntu 18.04 LTS? Or did you never install/test the Dell supported 18.04 LTS and just install the non-Dell supported 19.04?