Siri is unable to hear me I’m unable to use Siri on my MacBook Pro with macOS Siera 10.12.4. It says that there is some “Siri Audio Problem.” 
The issue goes away when I restart my Mac, only to return after a very short time.

I have Dictation off.

Here is what it looks like:
I encountered that bug again and solved it with the following Terminal command:

sudo kill -9 `ps ax|grep 'coreaudio[a-z]' | awk '{print $1}'`


Within 5 secs Siri works, no need to log out / reboot.

Can somebody please check whether this solution works for you as well or not. And maybe someone can come up with a clue of what to do with audio drivers to stop this from happening in the future?