I'm working on a grid shot aim trainer on roblox but after i hit 3 blocks, mouse.Target isn't detecting anymore, why?

here is the video link. https://streamable.com/kyduu8

local script:

local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

mouse.Button1Down:Connect(function()
	print("hii")
	if mouse.Target.Name == "Box" then
		print(mouse.Target.Name)
		game.ReplicatedStorage.newbox:FireServer(mouse.Target)
	end
end)

server script:

game.ReplicatedStorage.newbox.OnServerEvent:Connect(function(plr,v)
	v:Destroy()
	local b = v:Clone()
	b.Parent = workspace
	b.Name = "Box"
	b.Position = workspace.Grid[tostring(math.random(1,9))].Position
	b.Size = Vector3.new(3,3,3)
	print(b.Position)
end)
Anonymous