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?