mine does this thing were about every 4 times I startup, the port it's plugged into on the unpowered hub flashes, and the mouse doesn't work. If i unplug it and plug it back in, it works fine. I would plug it into the keyboard but it's cord is way too long.
I'm guess it's drawing too much power, but I don't have any spare power plugs to plug in the hub's power brick.