RB951u 3g Int Doesn't Connect

Hi

So I have a RB951u that doesn’t want to connect to the 3g interface. The interface has been created when the usb dongle was plugged into the usb port and it was running initially but it was never working.

Now however the interface doesn’t run and the everytime I enable the interface it just sits there maxing out the CPU.

Any ideas why the interface won’t run and any ideas how to resolve this besides me deleting the interface and starting again?