mobile

i installed rr 5.1.5 on my gt9105 i have one problem that on voive calls of chatting programs i.e whatsapp or line or messenger the other side always hear his eco unless i press my mic. button on and off then no more eco is their is a solution for this.problem note that rr is based on aosp and.omni rom and this is cm11 kitkat4.4.2 note also if i changed the rom to later vertions problem is gone but this release is the best one i have ever seen too much stable and i dont want to migrate thanks