well all was well up till last night joined a server started to play. i went to go prone nothing happened.. thought it was a bug with that server so i went to another server same thing. so i checked my key binds all was as before, i use mouse button 4 to go prone it was still the key in the game controller menu thought i'd check the battery level all was well but put new batteries in just in case. still the same problem as before went into the menu to change the keybind tried to put mouse button 4 as prone nothing it was as if the menu never recognised mouse button 4 i have been using that bind for 5 months without problems anyone else having problems with this. btw im using a logitech mouse. all other games i play still recognise that button so it is not a fault with the mouse.