Hi,
I think I have the same problem: after some time my voice isn't heard anymore but if I reset fs2crew my voice is heared again but the FO's voice is gone, he's just doing his things without saying anything...
I am currently using three different versions (dash, 737, 777) of fs2crew but I only have this issue with the PMDG777-version and some time ago with the V3 version of P3d everything was working fine, also I am using the same usb port for my headset for 3 years now, so it can't be a audio driver or hardware issue, right?
Thanks for any help :)