And that's why you were logged out.
It had nothing to do with not having internet.
You don't need internet to fly ... just to log in after you haven't flown for several months.
I've been flying DJI drones since June 2017 when I bought my Mavic Pro. I've flown in many countries and locations. Sometimes when I'm home, I fly 4 batteries a day of out of range way point missions, while I'm watching TV. But after having one...
There is a time limit set by DJI where it will automatically log you out. From most posts it is around a month give or take. It has happened to me once. So I make sure to log-in at lease every other week just to be safe. I have never had the...