The subject message on my iPhone 5S (including “Please check the battery is fully inserted, charged and that you are connected to the drone in your devices WIFI settings.”) has appeared during some of my manually-guided flights in GPS Mode. (To date, the message has not appeared during auto missions using Mission Planner.)
During the latest, manually-guided flight, the message appeared and remained on display, blocking much of the video view, which doesn’t help when trying to guide to a landing. I waited for a few moments and GPS Mode was restored, however the message remained. Apparently the message is not removable, even temporarily. It seemed odd to me that I had no trouble continuing to guide the drone in flight, and it responded appropriately to the Return button. Thought I would report this soon, since it’s likely to present a frustrating situation to many users. That said, I’m having fun with this remarkable product. Should be a staple of many STEM programs in schools.