I have the same problem, i bought a 8 gig card, worked for two months, now wont read the music anymore or connect to computer. Put in old 2 gig, reads music, but wont connect to computer so cant update my music. Put in the 1 gig that came with it that i havent used, wont connect to computer. Called T-mobile got a new G1 for $10, but still wont read any of the cards. At this point im guessing its something to do with a new update.