PROBLEM

I have recently bought a U-Mix Control Pro, but am having problems with it.
Everytime i attach it to my lap top and start using, it stops dead after a few mins. I have to switch the contoller off and on again o get it back working. anyone any idea what im doing wrong?
Everytime i attach it to my lap top and start using, it stops dead after a few mins. I have to switch the contoller off and on again o get it back working. anyone any idea what im doing wrong?