keyboard case charging but not typing

[_radv_]

Same here. Mine also stopped registering keys, but charging works.

I think this problem appeared because I removed the keyboard while the phone was still turned on. 
...

Probably not a good idea, but I doubt that was the cause.  I say that mostly because that's not something I did.  Mine just never worked.  I got the phone in October and tje keyboard a few weeks later.  It hasn't worked, yet.