How many of the mesh nodes do you have? I have three including the primary one, and have had as many as 50 devices on my network and it has worked flawlessly. Many are low bandwidth IoT devices/hubs, but I've literally never had any problems over three years.
About 30 of the devices are low bandwidth IOT devices, I have one hub and one node.
well, google consumer products are not exactly know for being "premium" in anything.