I just purchased a new Lenovo T440s laptop (running Windows 7). It comes with 3 USB 3.0 ports. I currently have two of the ports occupied by USB 3.0 hubs, one with 5 devices, and the other with 7 devices. When I plugged my iPhone into one of the hubs I got a message that I had exceed my USB host controller capacity. How is this possible? What does it mean? What can I do about it? I've used the same configuration for years with my previous T420s laptop without any issue.