I'm not sure if this is related to my hub or MacBook, but just within the last 30 minutes my iPhone and wireless mouse, both connected to my USB hub, acted as if they were unplugged and then re-plugged. This has happened about three times now this morning. The iPhone does its little jingle sound and its screen turns on, and my mouse stops working. It all happens within about 2 seconds. Has anyone experienced anything like this? Maybe my hub is going bad, or the MacBook is having issues. I don't know.