Apparently the window exploding has something to do with the resistors for the heating elements shorting out. Thats what i was told anyways. It really should be a recall because its very dangerous (but so should the sunroofs). When mine exploded the noise was so loud. Its not safe and gm knows its a problem. Idk if they were fixed with the replacement windows. No problems since mine was replaced. Knock on wood.
SAme exact thing just happened to me in my 2015 sierra. Remote started it got in the cab could smell something burning. Didnt see any smoke. I shut off the heated seats and the defrosters. About five minutes later i heard a loud bang. The window shattered on the passenger side. If you find out what caused it please let me know. Hate to spend $700 on a oem window for it to happen again.