My Motorola Droid Razr Maxx HD works fine with a 16GB SanDisk card, but the 32GB card died in less than 3 months.  SanDisk will replace the card under warranty, but the SanDisk customer support team informs me that the replacement process takes about a month.  For two months, the card worked flawlessly, and then it started to have intermittent errors.  I thought it might be a problem with my phone, so I tried a 16GB card, and I never had a problem. When I returned to the 32GB card, the intermittent problems returned and got worse.  Eventually the card completely died, and it is no longer recognized by either my phone or my computer-connected card reader.  Both Windows 7 and my phone now act as if no card were inserted even when it's well seated.I plan to update this when I have used my warranty-replacement card for three months, but that will be at least four months from now.