GUI Keeps Flashing When Part Touched Problem?

This code works fine but the problem I get is when I touch the part that triggers the function, it sometimes flashes the GUI (by that i mean the gui is being repeatedly showing and stop showing itself for a while)

I notice it happens on the edges of the part that triggers the function.

Code Below:

function touch(hit)
	if game.Players:findFirstChild(hit.Parent.Name) ~= nil then
		player = game.Players[hit.Parent.Name]
		if player.PlayerGui:findFirstChild("ShopSetupGUI") == nil then
			gui = script.ShopSetupGUI:clone()
			gui.Parent = player.PlayerGui
		end
		repeat
			wait()
		until (player.Character.LeftFoot.Position - script.Parent.Parent.Pad.Position).Magnitude > 8
		gui:Remove()
	end	
end

script.Parent.Parent.Pad.Touched:Connect(touch)

This can be fixed with a debounce: A debounce is a basic coding term for a variable meant to stop something from being called a ton. It's really simple to make one, put this at the start of your code: local debounce = false, then on the first if-statement add and debounce == false so it looks like this if game.Players:findFirstChild(hit.Parent.Name) ~= nil and debounce == false then. Finally right before the if-statement closes add

debounce = true
wait(4) --Change this to the number of seconds you want the debounce to wait for
debounce = false

The finished code would look like this

function touch(hit)
    if game.Players:findFirstChild(hit.Parent.Name) ~= nil and debounce == false then
        player = game.Players[hit.Parent.Name]
        if player.PlayerGui:findFirstChild("ShopSetupGUI") == nil then
            gui = script.ShopSetupGUI:clone()
            gui.Parent = player.PlayerGui
        end
        repeat
            wait()
        until (player.Character.LeftFoot.Position - script.Parent.Parent.Pad.Position).Magnitude > 8
        gui:Remove()
	debounce = true
	wait(4) 
	debounce = false
    end 
end

script.Parent.Parent.Pad.Touched:Connect(touch)

Hope this helped, sorry it got a bit long. If it solved your problem please mark it as the answer. If it didn't work just comment on this and I'll see what I can do.