I have the Samsung Messenger (the r-450 I think it's called). I used to have music in it but I reformatted it by mistake. I tried putting more music in it last night, but as soon as I disconnected the USB from my computer, my phone froze. Then I took out the battery and replaced it and it worked fine, yet, when I placed the memory card back in it froze again. I repeated this process like 10 times then just gave up. It's a 2GB memory card and I put in maybe a little over a 100 songs.

Anyone know what's wrong with it? My friend put it in her Motorola Sliver and it worked fine.