Random screeching noice during FLAC-playback

[endl3ss]

Hi,
I'm new to this forum, so this might have been up before, but I haven't been able to find anything about it so far.

Right, short version:
Just got my 32Gb J3 yesterday, topped off with a 32Gb Sandisk SDHC, have spent last evening and night filling it up with music, mostly FLAC ripped in Winamp, and a few MP3's.

Whenever I play FLAC, I quite often get this high volume short screech (white noise really) at various points during playback. Very annoying to say the least, and I'm at a loss as to what causes it. I'm using the same files that I've used on my old, but still working iRiver H140 with Rockbox, as well as Winamp, and I've got no such issues there. I don't get it with MP3's, as far as I can tell so far anyways.

Settings on my J3, I'm using Jet Effect BBE Headphones, but I get the noise no matter what setting I use.

I use a Koss Portapro headset, also used with iRiver H140 without any issues.

Apart from that noise kicking in form time to time, sound quality is good, although I'm still figuring things out here....not sure I've found my sweetspot yet

So....any ideas?