I didn't believe the stories about cowons dying so easily... and mine died after a week of usage xD, loaded music 4 times, ejected the device correctly everytime, and the only different thing i did the last time is that i loaded a .flac album... can't think of anything else. It gets stuck on the loading screen at 50% loading, and never reaches the menu... same when trying to charge it or connecting again into a computer.
Checked the forums and it looks like there is no solution for this, also i used windows 7 to load the music, never used mac os or any other os than windows 7 with the j3... tried to reload the firmware again using tcctool and it doesn't work either (gets stuck at loading screen again). Also, the j3 doesn't show up when connected to the computer, but it does work on tcctool mode.
Any ideas? already started a RMA on export prive (bought it there) but it's going to be a PITA to send it back >_<