Music won't work until after re-start

[Chelot]

I have been having issues with my Droid2. Sometimes when I try to listen to my music I get an error message stating that the file type is not supported but if I restart all is well for a while.

Some backround not if it is pertinent but..

• On verizon
• Went from BB to Droid2. Tech just swapped sd card.
• sometimes it works just fine for days......

Any ideas? Thanks.