I just ran into this today.  It was inconsequential in my case, but frustrating.  I was able to connect to a WiFi access point and login.
My complaint is you can't head this off in advance.  You MUST just let it happen!  My Mavice 3 Pro let me know, also today, that I'll be logged out in 5 days.  Fine.  Can I logout now and avoid being forced out?  Nope.  The specific instructions are to log back in AFTER being logged out.  How am I supposed to plan for that when I don't know exactly when it's going to happen?  Just in "5 days".  
Come on, now, DJI, you're better than that.  I understand periodic re-validation.  But if you need to re-validate a user, give us an option to do it when we have time, before forcing the user off, so it doesn't just happen when we're about to start (and trash) a shoot!
Good thing cars don't do this, or full-sized aircraft with human pilots.  Wouldn't that be fun?  "You've been logged out", and the car slows to a stop on an interstate with traffic buzzing around you at 80mph.   Or mid-flight over water, "You've been logged out.  Re-login with WiFi."  Since there's no WiFi for miles, the plane flies in a circle until it runs out of fuel.  
Just wait, I guess.