Can't use any of my keys. None.

Well, this is a bug that has been happening to me every 10 games or so. Basically when you get into the game none of your keys work. QWER does not work, Y does not work, and I cannot use my actives either. When this happens I can basic attack and type in chat fine, but it seems to be just abilities/actives that are affected (with the exception of Y). It is usually fixed by a quick restart of the client but this has become a progressively worse issue as today I had to restart my client twice to get it to work. This bug seems to be client-side. I do not know how to reproduce the bug but I do think it may have a connection with Alt-Tabbing out of the game when everyone is loading in, even though the last time that this bug occured I did not Alt-Tab out of the game at all. I am also curious whether anyone else is currently experiencing this issue. I've seen some reports of it on the old forums, but nothing much on it. Hopefully this will be fixed in future builds, as it is quite annoying and it pisses off your teammates when you DC (even if it is before creeps spawn) and blame it on the client.