Default Video problems :/

after i got the 4,4,2 my camera sometimes record a video without the audio like yesterday i was at a music concert and all i got is just a video of an accordion player (facepalm)
anyone has any idea whats up with my phone :S and i think the problem connected to choosing the direct to save the video on

Hit thanks if i helped
phones:
Sony Z (c6603) running stock 4.4.2 locked bootloader rooted
xperia x8 running gdx 31b locked bootloader