Why is this tool breaking?

I have a tool that makes a sound when a player clicks the left mouse button. Here's the script:

wait(0.01)
repeat wait(0.01) until game.Players.LocalPlayer.Character

function Down(mouse)
    if script.Parent.enabledValue.Value == true then
        script.Parent.Handle.Fire:Play()
    end
end

function Selected(mouse)
    mouse.Button1Down:connect(function() Down(mouse) end)
end

script.Parent.Equipped:connect(Selected)

Inside the tool is another script that sets the enabledValue (a bool value) to false and then true when r is pressed.

wait(0.01)
repeat wait(0.01) until game.Players.LocalPlayer.Character

function onKeyDown(key) 
    key:lower() 
    if script.Parent.enabledValue.Value == true then
        if key == "r" then 
            script.Parent.enabledValue.Value = false
            wait(3)
            script.Parent.enabledValue.Value = true
        end
    end 
end


function onSelected(mouse) 
    mouse.KeyDown:connect(onKeyDown) 
end 

script.Parent.Equipped:connect(onSelected)

The script itself works fine, however when both the "r" key and the left mouse button are pressed at the same time, the script refuses to play forever until the tool is dropped and picked back up. Why is it doing this?