Focusrite Scarlett 2i2 making noise...

Hello!

So, my focusrite Scarlett 2i2 is making this random "hum" noise (https://soundcloud.com/user-713126817/noise/s-zIT87) everytime I plug my microphone to my interface. It's really annoying because it spoils my recordings. My microphone & xlr cable is working normally, because I went to local music store to test them out. This noise started suddenly when I was recording. It worked perfectly before that recording session. Please help me out

did you ever figure this out?
could be a cable. thats my only theory