With the USB connector box there is a manual given, on the back of which there are some troubleshooting tips. But the easiest thing to do will be to take it to the nearest service provider.
Most of the time its a problem with the hardware. My room mate also had to get his piece replaced. Can't trust chinese modems
She can try reinstalling the software etc. It also asks for a network setup initially. I had just canceled that. Don't know if that might have caused an issue.