I f you unpack that a bit, someone might be able to help...what is actually stuttering? audio only? video? Both? Did it work prevously? Does your USB/XLR cable require some power? Try a USB 3 socket, or perhaps the current USB socket is bad (does happen). Is there some noise gating/noise removal set as a filter on the audio? Can you try a different computer?
Personally I use a mini-mixer for my XLR inputs (choir mic, lectern mic, spare) and feed that into a Focusrite Scarlett (mixer in, radio receiver in) and that connects to the pc USB, which with the ASIO plugin to recognise both Focusrite input channels works a treat.