How to unanchor a model after 5 seconds?

Hi, so my question is how to unanchor a model after 5 secs its spawned in. So basically i have a disaster game with map changing script. But i want to make it so players and disasters are able to break the map which means my map needs to be unanchored. BUT, as soon as new map comes, it starts lagging super hard and the map starts breaking by itself because its unanchored. But if i make it anchored then the lag is gone and map is good but no one can break it.. So how do i make it so after new map spawns in it wont break by itself? Or how do i make that if the map spawns in then it stays anchored but after 5 seconds it will unanchor? Heres the script: (Field... is used as a map)

print("Change Map Script Loaded")
    while true do
    wait(1)
    game.Lighting.Field1:clone().Parent = game.Workspace
    wait(60)
    local msg = Instance.new("Hint")
    msg.Parent = game.Workspace
    msg.Text = ("Changing Arena...")
    wait(4)
    msg:remove()
    game.Workspace.Field1:remove()
    wait(1)
    game.Lighting.Field2:clone().Parent = game.Workspace
    wait(60)
        local msg = Instance.new("Hint")
    msg.Parent = game.Workspace
    msg.Text = ("Changing Arena...")
    wait(4)
    msg:remove()
    game.Workspace.Field2:remove()
    wait(1)
        game.Lighting.Field3:clone().Parent = game.Workspace
    wait(60)
    local msg = Instance.new("Hint")
    msg.Parent = game.Workspace
    msg.Text = ("Changing Arena...")
    wait(4)
    msg:remove()
    game.Workspace.Field3:remove()
    wait(1)
        game.Lighting.Field4:clone().Parent = game.Workspace
    wait(60)
    local msg = Instance.new("Hint")
    msg.Parent = game.Workspace
    msg.Text = ("Changing Arena...")
    wait(4)
    msg:remove()
    game.Workspace.Field4:remove()
    wait(1)