I bought one of these keyboards a while ago. Dell SK-8135. When I got it, a number of keys barely worked. I say barely because if you held them in for a while, or just bashed them around a alot, you would eventually get a keystroke out of them. So I got a replacement sent to me, and it played happily for 2 months or so. Now, the new one is doing it too! It's doing it to these keys: E,R,I,O On the old one, I remember it doing it to the D and L keys as well. It's such a pain. If you bear with it for a while, eventually it will fix itself. I don't get it, as trying other models of keyboards, I have no problems, but this model just doesn't want to play nice. There are no drivers available for it, and I've tried re-installing the current MS drivers. Also tried another USB port. Any suggestions?