Humanoid:MoveTo movements are not working right?

Hello, I am making 15-20 NPCs walk randomly between points. But, after a few seconds, the movements get less smooth and jittery.

Video

Code

for i, point in pairs(waypoints) do
        script.Parent:MoveTo(point.Position + Vector3.new(0,3,0))
        local move = false
        script.Parent.MoveToFinished:Connect(function()
            move = true
        end)
        script.Parent.MoveToFinished:Wait()
    end

Any help is appreciated thanks