I have a Phantom 3 Professional and a Mavic Pro Platinum. I have used a Ipad Mini 3 for years with no issues whatsoever. Recently I upgraded to a Ipad Mini 4 and have had no problems with that either. The apps have always worked very well. Preference in ones I have worked with are for the...
Looks like you are not on most current version for the aircraft assuming you are using P3P.
If your app is V 3.1.50
Aircraft should be V 1.11.20
RC V 1.9.2
Mine is working perfectly with no problems at that level for a long time now.