Me too I have the same issue. When I record, the sound goes off while im singing and the part where I sing when this occurs, is not recorded. That was for the very reaosn why the salesman told me to get this sound card and a real mic instead of a usb microphone and now I’m waisting valuable time on a forum.
I have come across this problem I “think” it is to do with the power being supplied by the USB bus, ie it’s not quite enough on the laptop, that is why it works on a desktop which doesn’t have the same power issues. It might be worth trying a powered hub, I know it is recommended NOT to do this for audio interfaces but it might sort the problem out.