Your not alone, mine did the same thing about 2 years ago. I always keep sunshades in and it still cracked. It’s common with the premium dash. I have 2 cracks and eventually will purchase a dash cover. Sad to see GM cheapen the plastic and connecting points on the dash. I tried speaking to the dealer with no help. They want a stupid amount of cash to replace it. Since I’m very much able to do the job myself, I will. Good luck and let us know if you find a quality dash cover, cause I will probably do the same.