At the moment, I've only experienced the audio snap/crackle when playing games.
When playing music via Spotify I haven't experience any crackling yet. As for calls, haven't called long enough to tell for sure, but so far no crackling as well.
It's only when I play Mobile games, Like Mobius Final Fantasy, and HIT, as well as CSR2 that I experience snaps & crackles from the audio. (HIT reproduces this issue more frequently)
@Equalizer - No I haven't used any equalizer, nor apps that modify the sound. My FP2 is vanilla, I've only installed games so far on it.
I've been experiencing this issue, since FOTA 1004 up until yesterday FOTA 1005 - The issue still persists.