KitchenAid Refrigerator Buzz/Hum Noise (KFIV29PCMS03)

[Ebkiel17]

My refrigerator is making a very loud buzzing / humming noise - see video. I can hear it from another room and even from upstairs. The noise is not constant, usually it is totally silent but it will sometimes hum like this for 20+ minutes. The noise seems to be coming from the back of the fridge towards the top.

Any ideas on what is causing this?

 

 

[Ebkiel17]

Here is another video. It seems to get louder when the door is opened, which makes me think it is something inside the refrigerator.