Hello!
I move between multiple Wifi and cell connections throughout the day and I find that my VPN continually disconnects itself and then will not automatically reconnect. At times, it will drop for no reason, despite being in the same place for severe hours, e.g. at home.
I use pixle 6, most recent android version update. All battery optimization is turned off. Automatic VPN is turned in. Always on is turned on.
What else is there to check?