Moonroof shattered

That looks exactly like my 2013 Subaru Impreza sunroof. I was driving home from work talking on hands free to my wife when BOOM there is a huge noise and we both freaked out. I heard wind noise and glass falling across my roof as I drove. Luckily my sunroof shade was closed and caught all the glass. My insurance covered it when Subaru would not. It ended up costing $1100 to fix (I only had to pay a glass deductible of $100).
If you google spontaneous sunroof failure, you will find many similar articles. One speculation is that there were imperfections in the metal used. The metal then corrodes and expands very slowly, eventually causing failure. They all end up exploding upward like a volcano. I traded in my Subaru for my Mazda (which also has a sunroof), but I still believe there really is a problem with these sunroofs and not just a rock... They say a rock would need to hit the sunroof going straight down at like 50mph to break it and there is very very little chance of that.
 
My moon rood was fully open when it shattered. I set the wind deflector on the CX-5 and it took up a 1/3 of the opening. I don't mind the wind, I just want to prevent this from happening again.

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One thing that might work is to put an after-market tint on the sunroof to at least contain the glass if it breaks. When mine exploded, it scratched my paint on the roof and put lots of tiny shards of glass in all the nooks and crannies like hatchback and window sills... what a mess.
 
Out of curiosity I checked the safety ratings imprinted on the moonroof (2015 MY) which says:
DOT23 GB | CCC A000923 | Nippon Safety AS3 | NSG M3Q8 | V(E6)43R-003021

Anyone knows how to decode this?

BTW, ratings for the other windows are as follows.
1st row: DOT23 GV UV | Nippon Safety | AS2 | NSG M4Q8 | (E6)43R-00014
2nd row: DOT23 GA | CCC A000751 | Nippon Safety AS3 | NSG M3Q8 | V(E6)43R-003021
2nd row (triangular pane): DOT23 GA | CCC A000751 | Nippon Safety AS3 | NSG M31G8 | V(E6)43R-005844
2nd row (rounded triangular pane): DOT23 GA | CCC A000751 | Nippon Safety AS3 | NSG M28Q8 | V(E6)43R-007981
rear window: DOT23 GA | CCC A000923 | Nippon Safety AS3 | NSG M28Q8 | V(E6)43R-007981

Interestingly the moonroof appears to have something in common with the 2nd row window pane (at least the 'Nippon Safety AS3 | NSG M3Q8 | V(E6)43R-003021' part). To be honest I have no idea if this bears any significance. Anyone?
 
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