I user CC with iRacing but I think this is a common problem:

I've set voice recognition mode to "Press an release button".
I have a (controller) button assigned to "Talk to crewchief" action.

This assignment is sometimes "lost". I have to restart CC or reassign the button. Reconnecting the controller or rescanning does not work.
Maybe the power saving plays a part in that loss.

It is really annoying to always "test" the radio button before driving.

Of cause you may say thats much more realistic ....