Sorry to hear of the continued frustration! Very unfortunate that Razer won’t engage nor provide the older BIOS version for a backflash as a workaround.
Unfortunately at this stage of USB-C/TBT3, there are still various model-specific compatibility issues to contend with, and each system OEM handles this scenario differently. Again, we’re happy to provide test devices to system OEMs for debugging if they’re interested.
Since both you and Andy are contending with the same issue occurring as a result of a newer BIOS, there unfortunately isn’t any reason to expect different behavior with a replacement dock. But just as we offered to Andy, we’re happy to issue a refund and assist with a return of the unit. If that’s of interest, please just email email@example.com and we’ll be glad to provide next steps.
For 4K/60 gaming, some customers remove the dock from the setup and simply use one of our USB-C to HDMI or USB-C to DisplayPort cables: