No Voice when calling

Jun 17, 2014
Hi All,
Recently, Ive bought Mi3 from Xiaomi original website at China around last 2 weeks. Its worked fine and Im happy to use it. But, suddenly 3 days ago, I could not hear any voice when I call or receiving any call. So, two days ago, I've read most of the thread related to this issues and I've tried anything like reboot, reflash, flashing back to stable room 4.3, etc. But, nothing solve my problems. Do you guys have any solution ?
Now, Im using MIUI 4.6.13 multi downloaded from here

Thank you in advance.