My gui is not appearing on a local script. Why?

I am working on a movement gui that allows people to teleport. It works fine when the remote event is fired the first time, but when its fired another time, it stops turning visible, despite the workspace saying its visible. What is going on?

Local Script (In StarterCharacterScripts):

player = game.Players.LocalPlayer
character = player.Character or player.CharacterAdded:Wait()
humanoid = character:WaitForChild("Humanoid")
assignRoutes = game.ReplicatedStorage.Remotes.AssignRoutes
canPass1 = game.ReplicatedStorage.Remotes.CanPass1
canPass2 = game.ReplicatedStorage.Remotes.CanPass2
getWeapon = game.ReplicatedStorage.Remotes.GetWeapon
door1 = workspace.EmptyHouse.Door1.Closed
door2 = workspace.EmptyHouse.Door2.Closed
playerGui = player:WaitForChild("PlayerGui")
gui = playerGui:WaitForChild("BloxianPanel")
frame = gui:WaitForChild("EmptyHouseNavigation")
moveOn = frame:WaitForChild("MoveOn")

assignRoutes.OnClientEvent:Connect(function(path)
	print("Route Received")
	local route = path
	local index = 1
	local timer = 0
	humanoid.WalkSpeed = 0
	humanoid.JumpPower = 0
	character:MoveTo(route[index].Position)
	wait(15)
	moveOn.Visible = true
	
	moveOn.MouseButton1Click:Connect(function()
		timer = 0
		if index == #route then
			if route[index] == workspace.EmptyHouse.BloxianTeleports.DoorTeleports.Door1 then
				if not canPass1:InvokeServer() then
					character:MoveTo(workspace.EmptyHouse.BloxianTeleports.JumpscareZone.Position)
					humanoid.WalkSpeed = 16
					humanoid.JumpPower = 50
					getWeapon:FireServer()
					moveOn.Visible = false
					return
				else
					index = 0
				end
			end
			
			if route[index] == workspace.EmptyHouse.BloxianTeleports.DoorTeleports.Door2 then
				if not canPass2:InvokeServer() then
					character:MoveTo(workspace.EmptyHouse.BloxianTeleports.JumpscareZone.Position)
					humanoid.WalkSpeed = 16
					humanoid.JumpPower = 50
					getWeapon:FireServer()
					moveOn.Visible = false
					return
				else
					index = 0
				end
			end
		end
		index = index + 1
		character:MoveTo(route[index].Position)
		
		moveOn.Visible = false
		wait(8)
		moveOn.Visible = true
		
		while true do
			if moveOn.Visible == true then
				wait(1)
				timer = timer + 1
				if timer == 8 then
					index = 1
					character:MoveTo(route[index].Position)
					break
				end
			else
				break
			end
		end
	end)
end)

Some simple errors people always make...

1. Not enabling the gui.
2. Not understanding how roblox functions when a game is run.
3. Its most likely an error with your code.