For some reason when using push to talk (Caps lock) repeatedly (not enough to start windows sticky keys) in conjunction with the Shift(temporary run) and alt key(my stance modifier) the mouse just stops working. The only way to fix is to unplug and plug the usb mouse back in. I am using a Roccat Kova mouse.

I cannot seem to reproduce it but it always occurs around the time I use the above keys.

I also noticed that when using a different key presets like for example the ones found on http://dslyecxi.com/arma-3/arma3-alpha-controls/ this issue never happened.

I am using Steam but I doubt that is the issue.