Zoom phone/contact center calls no audio after answer

On the latest version of Zoom Workplace app, using a Lenovo workstation, and Yealink WH 64 wireless headset.  Mostly it seems to work ok then for no reason calls will come in and when answered there is no audio.  Keep the sound app open on another screen when this happens the mic appears dead.  No moving of the volume as I speak.  When I use in another app headset works fine.  Then for no reason I can find the calls start working again. This happens intermittently, a reboot sometimes fixes sometimes not.  I uninstalled and reinstalled the application, changes headsets, next is to try a new computer.  anyone else have this issues or a solution?