So i bought a sony ericsson w 395... i have ~80 songs on the memory card. When i listen to music in the walkman player the phone freezes and after ~30 seconds it comes back but... a folder named r1da015 is created and inside it is a file named dump.txt.bis and has 16mb.... i have 11 files like that, one is created after each error... i think it may be the memory card but i don't know for sure.... can anyone tell me how to solve this?