Round Timer Freezing bug. How do I fix?

When a round is in progress and the timer is running and when a new player joins and spawns to the lobby my timer freezes. Is there a way to fix this?

My game script:

local GameTime = 120

while true do
    wait(5)
    local Hint = Instance.new("Hint", workspace)
    Hint.Text = "Game starting!"
    wait(1)
    local RandomNumber = math.random(1,2)
    local Map = game.ServerStorage["Map" .. RandomNumber]

    Map:Clone().Parent = workspace.MapFolder

    ftime = GameTime

    local SpawnCount = Map.SpawnCount

    for _, v in pairs(game.Players:GetChildren()) do
        Player = Instance.new("StringValue", workspace.Players)
        Player.Name = v.Name
        randomN = math.random(1, SpawnCount.Value)
        v.Character.HumanoidRootPart.CFrame = CFrame.new(Map:FindFirstChild("Spawn" .. randomN).Position+Vector3.new(0, 3, 0))
    end 

    while true do
        wait(1)
        ftime = ftime -1
        Hint.Text = "Game ending in: " .. ftime


        Playing = workspace.Players:GetChildren()

        if #Playing == 0 then
            for _, v in pairs(workspace.MapFolder:GetChildren()) do
                v:Destroy()
            end
            break
        end
        if ftime == 0 then
            for _, v in pairs(workspace.MapFolder:GetChildren()) do
                v:Destroy()
            end
            break
        end

        for _, v in pairs(game.Players:GetChildren()) do
            if v.Character.Humanoid.Health == 0  then
                workspace.Players[v.Name]:Destroy()
            end
        end
    end

for _, v in pairs(workspace.Players:GetChildren()) do
    workspace[v.Name].Humanoid.Health = 0
    game.Players[v.Name].leaderstats.Cash.Value = game.Players[v.Name].leaderstats.Cash.Value +5
end

end

Thank You and Help is Appreciated