Script disappears from ServerScriptService?

I'm trying to make a round system for my game but.. whenever I playtest it, the script disappears from ServerScriptService and the timer is set to -1. Could someone please help? Here is the script:

local RS = game:GetService("ReplicatedStorage")

local SS = game:GetService("ServerStorage")

local roundStarted = RS:WaitForChild("roundStarted")
local Timer = RS:WaitForChild("Timer")
local Status = RS:WaitForChild("Status")

--// MAIN SCRIPT --\\


while wait() do

    if Status.Value == "Intermission" then

        Timer.Value = 30

        SS:WaitForChild("Teleport Pads").Parent = workspace

        SS:WaitForChild("WaitForPlayers").Parent = workspace

        while wait(1) do
            Timer.Value =- 1

            if Timer.Value == 0 then

                Status.Value = "Round"

                break

            end
        end
    end

    if Status.Value == "Round" then

        Timer.Value = 80

        workspace:WaitForChild("Teleport Pads").Parent = SS

        workspace:WaitForChild("WaitForPlayers").Parent = SS

        while wait(1) do
            Timer.Value =- 1

            if Timer.Value == 0 then

                Status.Value = "Intermission"

                break

            end
        end
    end
end