I have a problem with coverage :( Mi2S

Nov 13, 2013
I have a problem with coverage. Even though I have a range of 3 lines or more of voice is distorted or tears conversation, not interrupting her,
For now, this situation occurs in the car connected to the bluetooth. I changed my rom to 4.3 CM and the problem is resolved.
In my opinion the fault of the rom MIUI ROM 3.11.15 and below.

I turned off the optional microphone (noise reduction)
Energy efficient mode (I thought that maybe bluetooth

Is there a kernel or radio solving this problem?-Mi2S