Didn't search for similar threads before posting this. There were already a bunch of great suggestions for mitigating this in a related thread, so no need to reply to my query at this point. The problem has been intermittent, so it's not that the device isn't powerful enough. I simply didn't perceive the pattern that leads to the warning message, until reading the related thread. Now I'm certain it's because I screen record while flying. I'm able to fly and record using my dedicated iPad and DJI GO 4 with the Mavic Pro, so I just didn't make the connection at first.
Also, it was 100 degrees outside when I flew (~38 C) and the phone was hot. To top things off, I flew in my backyard, where the WiFi is very strong, after not using the setup for a week or so. The phone was therefore using a ton of power updating everything and anything in the background. Since I don't use the device as a phone anymore, it's time to remove all the apps and background processes that slow the device down.
Pretty short thread now, huh?
I would like to know what the symbology is supposed to depict in the bottom center of the app. Guessing it only appears when the cpu is fully loaded and the connection between the device and aircraft is tenuous.
Cheers.