blainey

Hi, i bought my S4i from amazon back in december/january and i have to say they are the best headphones i have ever owned and up until 2 weeks ago i hadnt a single problem with them. It first started with the speaker not picking up my voice on calls or for voice commands, but in a few days this seemed to correct itself? all other features were working fine. Now today i went to use them after stopping for about 20 minutes when they were working fine, and none of the buttons were working at all and the centre button only started working with increased pressure and intermittently. I did read a previous topic about if there had been moisture exposure, and i have to say this is most likely no as i wear them under a coat usualy when i am out and wouldnt realy use it in rain and i havent been near any moisture when these problems actually occurred. I have also checked the headphone jack and there is no dust in the port nor any noticable defects with the jack itself. Other than this i dont know. Please help me as i love these headphones and feel like my iphone is much more average without them! Thanks!!