I suspect it's wifi network related as well. Replaced my Netgear wifi 6
router with a TP-Link wifi 6 router and all my issues with my three
speaker group went away. Static IP (DHCP reservation) seems like a good
idea too.
Same problem here. Play music to group voice command works from android
phone, but not when giving voice command to any nest audio device. It
definitely feels like an open beta test.