You know... With every Samsung phone I have owned (Captivate, Skyrocket, Epic 4G Touch, AT&T S4, and now the AT&T Note 3) I have always had SanDisk memory cards. I have also always seen this post in ever forum saying it's the phones fault.
I am here to tell you that it's not. SanDisk is notorious for shipping bad cards. I currently have the class 10 SanDisk Ultra 64 GB SD that has been through 3 Samsung phones and an HTC phone. I have never had issues with it. I have had many other SanDisk ultra cards. Broken or lost by my own fault and 3 of the 9 that I have had were DOA.
It is becoming very tiring seeing this exact same post in every forum related to Samsung phones. I can bet money that if you send the card back to SanDisk (they have a lifetime warranty) you will likely not have any issues.
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[CENTER]Lost in a paper bag again...[CENTER]