wifi calling in Pixel 4a 5g, I can't hear

I have a Google Pixel 4a factory unlocked phone.  Also have T-Mobile 5G Home internet with my own mesh router in between.  I used to think it was an issue with my Gateway settings, but have experienced the same issues over other WiFi networks so I'm now convinced it's something in the phone.  I can make and receive calls via WiFi, however, I can't hear the other person but they hear me fine.  It's one way audio.  Doesn't happen every time but 90% of WiFi calls have this issue.  I've got all the latest updates and still having this issue.  Very happy with the phone otherwise, but tempted to get a new phone just to have reliable calls.  I can turn off wifi mid call and talk fine once on cellular only (assuming cell signal available).  It is very hard to disable WiFi mid call because the top settings menu keeps flashing black and won't allow me to drop it down and change settings.  Takes many attempts before I can get into the menu and disable WiFi.  Very frustrating.  Please help with a fix!