I purchased a Sandisk Ultra 32GB Micro SD Card. It had been working OK but this afternoon after I watched a movie I had stored in the card, it stopped working. The phone is unable to recognize it and I have tried using an adapter for my PC but it does not prompt nor recognize its presence. Logically, I believe this tells me the card no longer works but I am curious as to what could have led to this as it stopped working within two hours after it had been working just fine. Any thoughts? Any manner to get back to working?