Hey forum, so many people on this forum have so many great ideas and solutions, I thought I would pose this problem I have. With my new M, after several months, I got a notification that my SD card was bad. Fortunately I had it backed up, so I formated it in the phone and it was good again and I proceeded to reload my music on it. Then I was having issues with many missed calls, so Verizon sent me a refurbed, which helped to cut down on the number of missed calls. Several days ago, I get the same message, "SD card bad", so I again took it out, reformatted it and reloaded music again. The SD card is a SANS, 16 gb. I can't blame the phone, as it has been in 2 different phones, but what would cause the card to go bad, but is still functioning after format?