I would never argue that Autopilot is the best app I've ever seen. I had a lot of issues, crashed programs and erratical behaviour of the app and Mavic. No doubt.
But I have used it with numerous flights now (I know exactly how many) and it gave me some scary moments. Even when I flew over a waterdam when it disengaged. But I started GO4 and continued manually.
Still, like last weekend, I did waypoint routes, zippiness and other stuff and it worked out fine. If it stoppen (only once) I just restored and it was fine.
I know AP is very venerable for your mobile device and intervering during flight (I don't even use screen record) but as said... that worked out fine. Was really happy to see the constancy