Hi, Brian
Do you have anything set up in regards to, 'Push to listen' in your hotkey settings? To check this, you'll need to look in two places. First, go to Options > Hotkeys tab and see if anything is indicated in the first three entries. Second, you'll want to edit your active profile and then go to the profile's Options (at the top of the screen), then go to the, 'Profile Hotkeys' tab. See if anything is enabled in there. If nothing is set in those two places, you'll want to then go and make sure that you don't have a command or plugin running that is altering your listening state. To check this, you'll want to create a new profile as well as disable plugins by going into Options > General tab and uncheck the, 'Enable plugins' checkbox. Go to your newly created profile and see if the problem persists. If the problem persists, it's possible that your installation may have gotten borked. I would uninstall VA and reinstall (your profiles and settings will remain intact).
Hope some of that helps!