Watch out for those dirt cheap high capacity sd cards on ebay ,I am involved with semiconductor business and I can just tell you that there is no way a 32gb SD card can be priced that low at the moment ,those dirt cheap ebay 32gb sd cards are re-mapped and re-assembled low quality 4/8 gb sd cards that can be purchased for less than $2 dollar in South China
Read the related articles on this site and use their software to run a check on your sd card