Pleas help...
 

:( just bought a MP4, here we call it SVC994

here's the link of the image... SVC994

SVC994
•2.2'' Oversized 260k TFT Full Color Display
• Speaker 3D Sound System
• NOKIA BATTERY,REPLACEABLE BATTERY (BL-4C)
• Built in Microphone
• Dual Earphone Jack
• FM Tuner
• SD Slot Max to 1GB.

At first it plays MP3, MP4, WAV etc.. then a few months it doesn't play MP3 music anymore... tried format the unit, still not playing MP3's. But MP4, Wav still plays. please help!... what can i do to work this unit.