When I first bought this keyboard about 2 Years ago, the Alt key and the AltGr key were unresponsive. This changed about a month later though, as both keys suddenly started working again. I was obviously very glad and stopped thinking about it, but both those keys have been unresponsive for around 2 months now again, and I don't know what I did. It must be something I accidentally did, right? If anyone could help me, I would be extremely grateful as I don't want to have to buy a new keyboard. Sorry for my bad english btw, I'm german. edit: My drivers are updated, so it's not that!