I know this is an old thread, but to add to it, My wife's 5-year-old '18 CX5 just had the sunroof shatter while driving down the road. Seemingly spontaneously. Not following any vehicle, very average temperature, cloudy day, no likelihood of rock bouncing onto it. Also, initially, there was a fist-sized hole of missing glass, but most of that glass ended up sliding on the roof behind the sunroof, evidence that it shattered with upward forces. It is tempered glass, not laminated. From online research I've done so far, it seems this is an uncommon but not unheard of phenomenon for cars of all makes with sunroofs and glass roofs. Spontaneous shattering like this could be a flaw that takes time to reveal itself (poof!), or unusual stresses (temperature or incorrect stresses from when it was assembled, etc), or other unknown causes. Ours will be covered under insurance, but still a $300 deductible.
Buzzman12, I can't blame Mazda (or all the other manufacturers) for balking at covering this under warranty. This is an insurable claim, just like a rock-busted windshield would be. The issue being that the nature of tempered glass makes it really hard to determine a definitive cause. So, I claim to Mazda that it broke spontaneously, but really, how do they (or even I) know it wasn't a rock, kid's baseball, or who knows? And considering how rampant fraud and scamming is in this society and culture, I don't blame anyone for needing proof. (Sorry for the cynicism!)
Considering the excellent reliability of this car and the other 5 Mazdas we've owned over the past 18 years, I can accept this is just freak bad luck and so it does not shake my faith in Mazda generally. But geez, what a pain!!
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