So, I know these questions are ancient. But I've found the cause of this behaviour in my Cordless MX Duo Keyboard. This behaviour seems to happen when the batteries in the keyboard move around too much. When shaking the keyboard I get this exact behaviour where it spams "r15.2" with a bunch of other random letters aswell. The solution would be to secure the batteries firmly. Although I haven't been able to do so yet.
387 views
Usually answered in minutes!
×