Well, I have experienced my first dead micro-SD card with my 650GW. I noticed that I had gotten a couple of resets while driving. I took the chip out and plugged it into my computer. It wouldn't even connect. I tried other adapters, but none of them worked. I tried another chip as an experiment and it worked just fine, so it is definitely the card. I had been using it for about 2 years. It was a SanDisk 128GB Extreme Plus. I have a backup chip of the same type, so it is no big deal. But this is the very first flash memory failure of ANY type in ANY of my equipment in all the years I have been using flash memory.