The Client is Sending Keyboard Keys

I have a Problem while Playing the Game. The Client is Sending while
Fighting Bosses or Groups of Monster Keys that open Random My Windows
Menü and the News Menü. This is Killing me, deleting my Exp and its not
Fun to play with this. I have already Blocked the Shortcut Keys by my
Self with Windows Power Toys. Its not posible to open it by myself with
Shortcuts. I have this only in this Game. Can
you Explain me whats going on here. Is this a Bug, is this my Stalker or
what is this?