I bought a 2GB memory card for my Nokia 6350, and I put some songs onto it until I got to about 500 MB. After that, when I tried to put on more songs, it said operation failed. So I deleted some songs, and tried to put more on, and it worked. But then I got to a certain point to where it said operation failed again. When I check the memory, it says there is more than a GB left. Does anyone know what to do? Thanks.