Unclear voice problem (navigation voice, phone via bluetooth, camera)- MTCD 5.1.1

I have problem with unclear voice. Radio station play ok (clear), but navigation voice, phone via bluetooth, camera DVR awful creaking. I noticed that a few minutes the voice is good, but then always breaks.
Sample with phone calling is on youtube - please find film: oieJpkONicU (I am new user and I don't able to posting links)

Radio is on Lollipop MTCD_KD_V1.52_1 (rk3188).
Please help me, because outside radio station with anything I can not use.

issues in front camera Unclear

hi evrey one

first thing i,m sorry for bad english :D:D

second thing i have problem with my z1 the camer Unclear when i take picture ,some time, not evrey time

i don,t why

how i can fix it ?

thnx for :D:D:good::good: replayes