32GB Sandisk Micro SD suddenly stopped being recognized by Galaxy S3 phone

Same exact issue here, only with the 8gb card.  Does anyone know if there is a way to recover the stuff on the SD cards? 

It sounds like the only option being offered is a replacement.  I also can’t remember when I bought it (and I’m certain I don’t have the reciept).  Does anyone know if there’s a way to tell on the card itself if its date stamped somehow?