Thanks for reaching out. I appreciate @MplsCustomer for helping here.
I know how it feels when you're having connectivity issues on your Google Nest Hub Max. These can be caused by several factors such as network congestion, distance of your Nest Hub Max and your WiFi router, and outdated Nest Hub Max's firmware version. Let's go ahead and try the steps above and see if that improves the behavior of your Nest display.
Let us know how it goes.