I just returned a maxed out XPS 13 (9370) I bought (with the 45W charger). The reason was HDMI to USBC for an external monitor worked in my unit, but killed bluetooth, thus rendering the computer of little use for productivity with external bluetooth mouse and keyboard. Bluetooth also was killed when plugin in an external monitor with VGA to USBC with an adaptor. When I disconnected the monitor, bluetooth came back, sometimes needing a reboot. I had latest drivers and bios. Dell tech support said it was a known issue, which leads me to believe it was not a defect of my particular unit, but I cannot say for sure. Dell also told me a dock would fix the problem, but that solution did not work for me (I work at three different locations with external monitors). Are you aware of this bluetooth issue? I have not been able to find a reference to it anywhere in any review.