I wrote elsewhere (see below) that I thought this might be happening because SCID was running in the background, and it might be. Even so, I now think it’s a glitch. Wrote previously: Every time I go back to the farm from a small (chore or other app) break it’s been asking me to choose my farm. That usually only happens if I close out the app or if I’m away long enough to disconnect from the server. I switched around my two biggest farms in order to put my main farm on my fastest device. Because of that I have to choose the farm whenever I open the app on these devices.
However, now it’s happening much more frequently and even when I am in-game. When I go from town to farm it pops up asking me to choose. Just now, I finished loading a machine on the farm and it popped up again.