I just upgraded from a 2gb SD card to a LEXAR 16gb class 10. I transferred all my contents from my old card to the new one on my PC, put the new card in my phone and it lags REALLY bad! My gallery takes FOREVER to open, if it opens at all. When I open my gallery, sometimes the screen is completely empty and it just locks up. Looks like I transferred everything right, but what's going on here?!?! Ugh...technology!