mobile

hi i installed rr 5.1.5 based on kk4.4.2 on my gt9105 with nebula kernel 3.20 and pure perfornance 1 .4 i have only one problem that on chatting programs when making voice calls the other side always hear his eco unless i switch on and off the mic i.e press on the mic botton twice so any help for this problem note that this problem came before installing the.nebula kernel or pure performance and this release is the best i have ever seen better than later verstions note also when i installed later vertions problem solved but i want to be on this release most stable one and very fast thanks