Flac with crackle

As the title sais: When I play an album consisting of Flac files, encoded with foobar2000, the music is accompanied by occasional crackle. I tried level 8 and level 5, with the same result. Player firmware is 1.18.

Have you tried ripping them with a different program, like EAC?

They are ripped with EAC. – MP3s from the same .wav files are fine.