I was mistaken about my iPad being an iPad Air version. Actually I purchased my 9.7” iPad in 2017 and it’s a 128gb WiFi +cellular.The iPad Air is pretty old by tablet standards (2014 or 2015 depending on which version you have) and has a fairly underpowered cpu compared to newer models (A7 chip). It is similar in speed to the iPad Mini 3 I mentioned in my earlier post above. I don't think these A7-based devices have the horsepower to handle the demands of the Go4 App reliably, especially with the 2 video feeds from an I2. Since you have a CrystalSky I'm not sure why you need to use your iPad too, but if you do need a reliable iOS-based platform I'd suggest getting a newer iPad. As I mentioned above I'm using my iPhone X as a backup for my CrystalSky, and I'm not seeing any disconnects, while I was seeing them all the time with my iPad Mini 3 running completely up to date sw.
It’s the 4th generation iPad so it should more than be adequate to use with DJI GO 4. I seriously doubt if it’s the problem!! I still believe it has something to do with the app itself and not my iPad.