I have this problem too. I hadn't flown for a while so I thought I better fire it up before taking it out just to check its status etc. It worked fine as always but had the messages to update.
Normally I just do this without worrying too much about it.
So then I went to take it for a flight, firstly it wouldn't connect with the phone and App kept closing.
I was in a very remote spot and had no signal so I thought maybe it needs to connect to the internet which would be ridiculous considering where these things get flown.
Next I tried it with my iPad, same thing happened.
But then it randomly did connect with the mavic so I thought great and sent it up only for the app to crash again. I just hovered and restarted the app.
I found that if I had started recording before the app crashed then it was still recording after it restarted.
I was on a 4X4 trip and had to get footage but had a very difficult day with this going on.
At first I thought it was the FW update but now that I'm back home and looking into it i've noticed that the app just keeps crashing (iPhone X) even without being connected to device. Same on my iPad so this must be DJI Go4 problem.