Quite sure. I've re set the phone and only had DJI go 4 installed. It didn't make a difference. Also storage wouldn't be an issue with video chaching off.
IPhone 6, now IPad.
Latest upgrades for all units.
No crashes of apps.
I make sure there are no apps running in the background.
Also reboot IPad before I start flying.
Turn on controller then Mavic and lastly the DJI app.