Problem with my loop ? Second loop start when player connect

Hi people, I am actually doing a game with a LobbyServer and a GameServer. In the LobbyServer, there is a looped script. When a player connect to the game, it start loop. But the problem is that when a second player connect, it begin one more time the loop. I tried to correct that with a value which turn true when a player connect and the loop doesn't loop one more time. And now the problem is when a second player connect, the time goes 2 more time faster (it seem like the t = t-1 goes 2 time). Can someone help me ? Thanks for answer :D Here is the code.

local Looped = game.Workspace.Looped
Looped.Value = false
local Players = game:GetService("Players")
Players.PlayerAdded:Connect(function()
    if Looped.Value == false then
        Looped.Value = true
        StartGame()
    else
        Looped.Value = false
    end
end)

function StartGame()
local s = script.Stat
while true do
    t = 30
    repeat
        t = t-1
        s.Value = "The experience will start in "..t.." second(s)"
        wait(1)
    until t == 0
    s.Value = "Teleporting players"
    wait(0.5)
    s.Value = "Teleporting players."
    wait(0.5)
    s.Value = "Teleporting players.."
    wait(0.5)
    s.Value = "Teleporting players..."
    wait(0.5)
TeleportPlayers()
ElevatorMoving()
end
end