I'd open the single file with Audacity and take a close look at the area to see if there's such an audio signal.
I think the problem is within my hardware, because in the audacity I don't see any peaks or undesired snaps or flicks, plus moving balance to L/R channels proved that the audio signal is ok. So maybe it's just a coincidence that only during playing these two tracks in the original order hardware produces some unnecessary noises.
