i bought this phone like 3 weeks ago and i started to put lots of ring tones and wallpapers, themes, etc into my memory stick and also downloading videos from youtube, i used some program called super to change the format to 3gp to watch them
so like one time i dunno how or why but i lost all my ringtones, mp3s, videos, images, etc... so i put them all back and now it happened again and now when i connect the phone to my pc, i get this folders wich i never seen before
why i keep losing all my media files???
anybody has same prob or close??

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Try transfering files by filetransfer mode.
If that also fails- change your memory card as milkmang said.