Mechcables Pulse v2 Custom-Sleeved USB Cables

Same length as mine. That sucks, quality control seems to be bad with these guys because yours doesn't seem like an isolated incident.

5 feet. And I ruled out it being the USB port, it's the same port that I use for my keyboard normally and I tested it in my laptop with the same results. I don't have any other USB-C keyboards (or devices, really) to test it with. Sorta just chalking it up as an L because I've heard hassles about the return process with Massdrop.

It's also working with my ALT. How long of a cable did you get?