We've found the following steps can help when experiencing audio issues within Five9. Feel free to Test out the headset between each one!
Unplug & if possible find a new usb port to plug back in.
Reset Five9 Station, Refer to "Five9 Phone Station Reset" article.
Close chrome & clear cache once you reopen. For clearing Chrome Cache, you may reference the "Clearing Chrome Cache" article.
Restart your computer & while that is booting up, unplug your internet router for 60 seconds then plug it back in.
If you need any more assistance, please email telcoteam@selectquote.com. Thanks!