Custom Camera Type not working - what do I do?

I am trying to create a script to move the camera around an object. Everything works fine until I try to give the control of the camera back to the player - I set the camera type to Custom however the camera does not move around the player as it should. Every other camera type (Follow, Track, Attach etc.) will work, just not Custom. What is the problem here.

connection = game:GetService("RunService").Heartbeat:Connect(function()
    if i < 360 then
        camera.CFrame = CFrame.new(target.Position)
                  * CFrame.Angles(0, angle, 0)
                  * CFrame.new(0, 10, 50 + 30 * math.sin(math.rad(i/2)))
        angle = angle + math.rad(0.5)

        i = i + 0.5
    end

    if i >= 360 and i < 420 then
        i = i + 1
    end

    if i >= 420 and i < 480 then
        camera.CFrame = camera.CFrame:lerp(game.Players.LocalPlayer.Character.HumanoidRootPart.CFrame * CFrame.new(0, 2.5, 10), 0.1)
        i = i + 0.5
    end

    if i >= 480 then
        camera.CameraSubject = game.Players.LocalPlayer.Character.Humanoid
        camera.CameraType = Enum.CameraType.Custom -- every other type works fine

        connection:Disconnect()
    end
end)