What O/S is on the laptop?
My system has both USB-1 and USB-2 ports. I
originaly had the CM15 on a USB-2 port, and
the CM15A had fits every day or so. I moved
it to a USB-1 port and no more problems. I
guess it will work on a hub, but there are
some USB devices that don't like hubs, even
though hubs are supposed to be transparent.
The CM15A might be one of those devices. Try
it and see, if it works, post it here.