I have been having a recurring issue with my Galaxy S III since I got it in May. Every time I put music onto my phone using my Sandisk micro SD card, the music will play perfectly fine for a day or two and then I will get the message "Could not play the track you requested" and most (or all) of the music will have vanished. I use the Google Play music player, but the music cannot be found in the stock player either. The music is no where to be found on my phone or SD card. I have tried numerous things: Re-formatted the SD card many times, basic reset, hard reset, complete restore of the phone, used various music players - no luck. This is very frustrating, considering the main reason I purchased this phone was because it allows for external storage and thus more room for music. Any help would be greatly appreciated.