Since Patch 3, if I don't use the Voice feature for a few mintues, the microphone stops working.
The people see my name transmitting, but don't hear me speaking.
I haven't changed anything on my system, and none of my USB ports are set to power down to conserve energy.
If I alt-tab into Windows, it shows the volume has been moved down to 0. Once I move it back up, Voice transmitting starts working again.
Meanwhile, I never lose sound through the headphones, just the ability to talk.