Hi guys I have a very strange issue with my touch cover. At random the other day, the entire touch cover stopped working EXCEPT the volume controls, play/pause button, and the touch pad. Every other key doesn't work. I've tried just about everything to remedy the issue like disconnect/reconnect, restart, update drivers, clean metal connectors, check ease of access settings, etc. Anyone have any solutions? Second question is if I want to claim warranty, should I do it through the mail, or go straight tot he Microsoft Store even though I never bought it from there?