I am using my PC to copy music files onto my external 32gb micro SD card. When just a few albums are placed on the card, and the card is put in the phone the music is fine, all album art intact etc. As I add more music to the card, album art and tags in general start to go missing when displayed on the phone - and when I add more music still, this doesn't show on the phone at all. In the same vain, if I put video files onto the empty SD card they play fine on the phone, but if I add them to a card with a few GBs of data already on, the phone says it cannot play the files! I have tried two different 32GB cards - one unbranded and one branded. Any ideas?