I did at one stage could not get access to the bird from wifi on my phone because I had my data on for google maps? Correct me if I'm wrong, as soon as I turned off data it connected automatically? Was this coincidental? I don't know. I have read on the DJI forum that the two cannot co-exist together, this is not my quote, just only what I have read and just a thought.
most phones /tablets are set to want to find a wifi connection to the internet as a priority.
this allows you to move around and stay connected.
However when using the Phantom standard we DONT want that auto search.
the phantom doesn't provide a internet connection , just a direct wifi to the rc and
because if the signal from drone drops below a threshold
then the phone will reconnect to best internet AP automatically ,
then you have to find and reconnect etc. to the phantom.
Most androids allow you to modify this auto search wifi function.
my simple answer was one I used with my p2 vision plus.
When flying from home I cached maps and killed my router for the flight duration
that way I never had issue with dropping connection when I landed , swapped batteries, etc.
also seemed to help reduce interference without a wifi base station blasting 20 feet away.
good luck and have fun flying