That is a great explanation. Thank you! Yes I am in North Dakota and we have plenty of snow right now. My car is usually pretty clean and the sensors stay decent. Car is usually parked inside my garage, but yes. I think this is probably the reason. I'm still learning this car. It's the newest one I've ever had and I disabled some of my Onstar stuff so I didn't know if it was controlled by that or not.If you're referring to the lane keep assist, it often does not work well when it can't "see" the road lines well with the camera. This could be due to snow/ice/dirt on the windshield blocking the camera or to snow on the road obscuring the lines. The easy solution is to wash your car to clean the camera's view. If you're talking about the blind spot monitor on the mirror, this could also be affected by dirt and snow.
Obviously, this advice doesn't apply if you don't live in a snowy location.