Hello, I'm using UDOO Quad with a VOIP application named "pjsip". Right now, I can use audio and video communication from my PC to UDOO with success, but the big issue which I faced that sometimes the micro didn't work. For example, after 2 successful communications I can't hear any voice with the third one, then after three or four successful communication, I can't hear my voice, etc... However, the video communication is always stable. What could be the source of this problem. Should I patch the vt1613 audio codec or it might be another issue?