Generally it's been pretty stable recently, but the vision app crashed on me this morning while the Phantom was 1100 feet away and about 60m offshore (I was filming surfers). It took a little while to get it back, and I accidentally locked my phone while doing so - which meant swiping a finger over the reader to unlock etc etc. The total time spent faffing & relaunching the app was about a minute. I can see now why people take a separate phone with them to use as an FPV monitor. Luckily the skies were clear and I had 11 satellites, so the Phantom stayed put while I fiddled. Next time I'll just flick S1 to RTH. Another thing I've noticed - my range extender isn't showing it's state of charge on the app anymore. Is this some kind of low battery warning?