I switched up the locations of the nest mini and the google mini such
that the nest mini is closer to the router — this seems to do the trick.
The connection no longer drops. it appears like nest mini just has bad
range.
Same issue with me. I have a tri band WiFi 6 router. The 1st gen minis,
1st gen google home and Chromecast 4K connect perfectly fine but 2nd gen
mini disconnects from wifi every single day.