@agribugs, i have encountered this many a time. In my case, i happen to have 3-iPADs. Air, AirII, and iPAD PRO(12"). You would not beleive the inconsistency i get on these. I line all three up side by side and they don't even bring in all flight missions properly:
. So we have found that hardware also has different performance characteristics in the field as well. The iPad AIR fails to render all images during flight as the drone is taking them. The left had flight info still shows pictures beeing taken, so you can rest assure it is still taking photos. My AIRII does better, and my iPAD Pro is flawless. Another note: each of these reports warnings differently. The Air only displays 26% battery in popups, while the AirII sometimes verbal audio announces, while the iPad PRO verbally warns me always. Another quirky difference is the voice on AirII is SIRI like, while the voice on the iPad PRO is Male voice. DD has some really inconsistent behavior.
My point: Each of these iPADs are on the approved compatible list, yet they dont all work. My Air fails most and sometimes crashes the app. So can you try a more powerful device and ses if you have better performance? I hate to have to upgrade my devices, but my iPAD Pro is flawless and zero lag, zero glitches. I certainly seems like DD breathes better inside a more powerful machine.