Problem playing Mp3 files with PPC

Lanny

I have some MP3 files that I wanted to play on my iPAQ 2215. These MP3 files play just fine on my desktop. I copied them from desktop computer to both the 512MB Sandisk CompactFlash card and the 256MB Sandisk SecureDigital card, but some of these files will only play for about 20 minutes (these are 30minutes files) and then these was no sound for the last 1/3 part of the file.
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. n/ W; g& S9 ^. ^Is this a Windows Media problem or is this an iPAQ problem? Anyone had the same problem before?
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The iPAQ is running WindowsCE 2003.

Thanks!