Logitech G930 mic always open

[tknarr]

I got a G930 headset, and it's got one problem. When I go to use it using voice-activated, the mic's almost always open. When I go into setup and hit Monitor I show a good strong level when I'm talking and "Abs Zero" when I'm not, but Vent keeps the mic open nonetheless. The only ways I have to fix this are:
a) turn the level on the mic down to almost nothing, at which point I can barely be heard, or
b) set the sensitivity to just exactly the minimum shown when I'm talking, and even then a shift of just 1 unit causes it to either not open when I talk or stay open forever after I stop talking.

Has anyone else seen this problem and know of a fix for it?