frequent skips while playing flac files

I own a  sansa clip 2gb version 02.01.16F, though the version supports flac files but there are this frequent skips during playback! the files play fine on computer!with a flac file of 12mb avg.

Anyone there!!!waiting for reply…is it the frequency which needs to be downgraded or is it the file size…please help!!Tried converting mp3 to flac via xilisoft audio converter doesn’t play at all, though did support the ogg vorbis format!!!