Why does this script stop?

function onTouch(hit)
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	if player then
		screengui = Instance.new("ScreenGui", player.PlayerGui)
		frame = Instance.new("Frame", screengui)
		frame.Size = UDim2.new(1, 0, 1, 0)
		frame.BackgroundColor3 = Color3.new(255, 255, 255)
		frame.BackgroundTransparency = 1
		for i = 1, 10 do
			frame.BackgroundTransparency = frame.BackgroundTransparency - 0.1
			wait()
		end
		hit.Parent.Torso.CFrame = workspace.BedSpawn.CFrame
		wait(0.5)
		for i = 1, 10 do
			frame.BackgroundTransparency = frame.BackgroundTransparency + 0.1
			wait()
		end
		screengui:Destroy()
	end
end

script.Parent.Touched:connect(onTouch)

This script makes the screen flash when a player hits an object and teleports the player to another location, then fades out. The problem is, when the gui fades out and hits around 0.8 transparency, it just stops. The gui doesn't get destroyed. How come?