I live in a dry area, in the winter sometimes when I sit down to type a static shock will go off if I brush the edges of the case where there is exposed metal. When this happens it will often lead to the keyboard disconnecting from usb. Or staying connected (power on) but not responding to input. So far unplugging and replugging has always fixed it, but it's an annoying feature.

Re: #3 ...

Glad to hear that you're making design changes to fix this. It has happened on two of my boards now where the usb connection has become loose. I contacted support on it a few months ago and they suggested I try to open up the case and fix it. I haven't been able to do that yet but will give it a try.