Can confirm same behavior on iOS. Likely the same behavior as Back to Main Menu
In prior versions of the app, switching away for more than a few seconds would usually cause a brief disconnect from game, and reconnect on return. Now I’m seeing these things happen even if I’m using quick reply functions (and never leaving the app) or if something disrupts, like receiving a phone call or an OS low power alert.
And I see same behavior as OP, where these “disconnects” send me back to the main menu. Unfortunately, on iOS my behavior is slightly worse. If I try to queue again, I DON’T get reconnected to my game, instead the client crashes. If I restart, there is a decent chance I’ll be reconnected to the game, but this cycle can take as long as a full minute.