I have used the same 16 GB Micro SD card that I got with my original Droid 3 years ago. A few months ago when I had my RAZR Maxx, I bought a 32 GB class 10 Micro SD card at Costco for $30. I figured it would work great. Then it caused errors and made my phone freeze up. I took it back and got a refund. Factory reset didn't even help. Problem was gone. With the larger pictures this phone takes, I want to get another 32GB card. How can I be sure this won't happen again?