I have followed all the instructions for the TB15 with a XPS 13 9350 (Win10 64-bit)  and I get disconnects on USB mouse and keyboard still.  The disconnects happen every 60-90 seconds.  I have tried all the USB ports with multiple keyboards and mice that work fine when plugged directly into the laptop.

USB thumb drives seem to work fine though.  I was able to transfer files to and from several thumb drives without interruption.

Ethernet seem to be working just fine.

HDMI and Displayport seem to be working fine.  I have yet to try the mini-displayport and vga.