I have the same issue with my 2015 Yukon Denali. Been to 2 dealers who say they have never heard of the issue yet I have seen this problem in online forums over and over. I am frustrated because in fact this morning I was sitting in my home and the alarm randomly went off. I hit the unlock fob and it stops. It actually happened once when I visited the dealer and they offered no explanation or help. I wish someone could explain it. I'm close to getting rid of it