When player died UI doesn't update

[alixcoh_PM]

Hello! I have this code that create a box for the player and has a CD, if player move or do smth the box will disappear and start the CD. The problem I’m having is that when I use the box and after that the player die, he is not able to use the box again.
I’ll appreciate any help, thanks!

local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local magicBoxUseEvent = ReplicatedStorage:WaitForChild("magicBoxUseEvent")

local player = Players.LocalPlayer
local cooldownTime = 10 -- segundos
local canUseBox = true
local lastActivationTime = 0
local uiCDtext = player:WaitForChild("PlayerGui"):WaitForChild("PowerUps"):WaitForChild("magicBox"):WaitForChild("cdText")


local playerBox = nil
local isBoxActive = false

-- Create box
local function createBox()
	local box = Instance.new("Part")
	box.Size = Vector3.new(6, 6, 6)
	box.Anchored = true
	box.CanCollide = false
	box.BrickColor = BrickColor.new("Bright orange")
	box.Parent = workspace
	return box
end

-- Update CD UI 
local function updateCooldownGui(remainingTime)
	if remainingTime > 0 then
		if uiCDtext.Visible == false then
			uiCDtext.Visible = true
		end
		uiCDtext.Text = string.format("%.1f", remainingTime)
	else
		uiCDtext.Visible = false
	end
end

-- Start cooldown function
local function startCooldown()
	lastActivationTime = tick()  
	canUseBox = false
end

-- Destroy Box
local function destroyBox()
	isBoxActive = false
	if playerBox then
		playerBox:Destroy()
		playerBox = nil
		-- Init cooldown 
		startCooldown()
	end
end

-- Activation Box
local function activateBox()
	local currentTime = tick()

	if canUseBox and (currentTime - lastActivationTime >= cooldownTime) then
		local playerPosition = player.Character and player.Character:FindFirstChild("HumanoidRootPart") and player.Character.HumanoidRootPart.Position

		if playerPosition then
			playerBox = createBox()
			playerBox.Position = playerPosition
			playerBox.Transparency = 0 -- Do visible
			canUseBox = false
			lastActivationTime = currentTime
			isBoxActive = true

			-- Mov player to Spawn Box Point
			player.Character:SetPrimaryPartCFrame(CFrame.new(playerPosition))

		end
	end
end

-- Manage key F
local function onKeyDown(input, gameProcessed)
	if not gameProcessed and input.KeyCode == Enum.KeyCode.F then
		activateBox()
	else
		destroyBox()
	end
end

-- Connect function to keys 
UserInputService.InputBegan:Connect(function(input, gameProcessed)
	onKeyDown(input, gameProcessed)
end)


-- Update CD status with RenderStepped
local lastIsBoxActive = nil  

RunService.RenderStepped:Connect(function(deltaTime)
	if not canUseBox then
		local humanoid = player.Character and player.Character:FindFirstChild("Humanoid")
		if humanoid and humanoid.WalkSpeed > 0 then
			canUseBox = true
		end
	end

	-- Update UI
	if isBoxActive == false  then
		local remainingTime = math.max(0, cooldownTime - (tick() - lastActivationTime))
		updateCooldownGui(remainingTime)
	end
	
	-- Check if isBoxActive is the same value than lastIsBoxActive
	if isBoxActive ~= lastIsBoxActive then
		lastIsBoxActive = isBoxActive

		if isBoxActive then
			player:WaitForChild("PlayerGui"):WaitForChild("PowerUps").isBoxActive.Value = true
			print("Cliente -> Turn isBoxActive TRUE ")
			magicBoxUseEvent:FireServer(true)
		else
			player:WaitForChild("PlayerGui"):WaitForChild("PowerUps").isBoxActive.Value = false
			print("Cliente -> Turn isBoxActive FALSE")
			magicBoxUseEvent:FireServer(false)
		end
	end
end)

[alixcoh_PM]

It just loose the reference because the script delete when player dies.