Having same issues with my 2021 Blazer, dealership says there's no way this could happen on it's own. Sunroof did open on it's own leaving a gapping whole in the roof for rain to enter. It will not close at all now. Was informed that no one has ever had or reported this issue like this therefore it must be my fault and it will not be covered under warranty. Currently at another dealership for second opinion.Just wondering if you ever got an answer for this problem? I have a 2020 Blazer experiencing similar issues. The sun shade just started sliding back and forth on it's own and now both the sunroof and shade buttons are unresponsive.