For those who may have or are thinking about replacing the factory door speakers with traditional drivers, it is very possible that your speakers are getting damaged by water. Robert8 advised me that he had a Audiofrog GB60 fail in one of his doors. When he pulled it out he said it had obviously been getting wet and the basket was somewhat corroded. This prompted me to pull one of my Morel Mw9 from the doors and sure enough it is getting wet. With the speaker out, I did a water test against the outside glass and there was a literal deluge of water raining down at the speaker hole. Unless you have a marine grade speaker your speaker is eventually going to fail without protection. Speaker are generally tested for humidity but not direct water intrusion unless they are marine speakers. Totally make sense now why the factory drivers have a inverted magnet and voicecoil, it wasn't for mounting space. The back of that driver must be treated to protect it from all of the water because it is getting wet as well.

NVX makes silicone rubber water shields as one way to protect your drivers.