Why does while true do stop doing anything after some time?

While true do works for some time but stops. Here is the code:

local Spawns = {}

while true do
    for i,v in pairs(game.Workspace.Spawns:GetChildren()) do
        v.Name = v.Name..i
        table.insert(Spawns,v.Name)
    end

    local picked = Spawns[math.random(1,#Spawns)]
    local spawn1 = game.Workspace.Spawns:FindFirstChild(picked)
    local zombie = game.ReplicatedStorage.Zombie:Clone()
    zombie:SetPrimaryPartCFrame(CFrame.new(spawn1.Position+Vector3.new(0,3,0)))
    zombie.Parent = workspace   
    wait(2)
end