Thanks for the tips Owen, i've been trying it since you posted, still I get this sound, i've made another sample of some notes with hey and you sounds, and by feeling it seems more like phlegm than this distortion, also I have asthma, some allergy could make this, I have an appointment with an ENT to check this because it's been for quite a while.
Also it just happens up on the C4, in high notes above the high C the sound is minimal.
you can hear it clearly at the end of the track
http://picosong.com/P8mP/