A30 units losing part of their config

I have a 7 Wireless Access point system using Google Wifi. Sitting on top of that wifi network, i have 5 A30 music streamers configured. several of them lose part of their configuration and start announcing on the speakers “in setup mode”…etc. i have to power cycle them to get them back on the network. if i configure them with the mobile app, It takes several tries before it will join the network.

any ideas? my firmware is .35 they all have really good wifi signal.

thank you