Sometimes when I connect the headphones jack, the audio still came from loudspeaker, not the headphones. To resolved this I have to plug in and out the jack several times. this happen to me 2 times ; first with the standard headphones supplied with lumia 2nd time with my monster headphone. I wondered if anyone expereince this problem. I haven't visit the nokia care yet because the problem is rarely occured.
Didnt' happen on my Lumia 920. Honestly I don't use earbuds that much but it usually happens on my laptop and happened with other phones.
Probably wp8 doesn't detect the earphones fast enough or correctly to redirect the sound.
If i have helped at all a click on the white star below would be nice thanks.
Thanks for all the comments. It seem that something went wrong with my nokia. Today it fail to detect any headphones at all. Ah bad luck but I've to visit nokia care now. Thank you everyone.