This would also suggest the six year old iPad Mini 4 is running pretty close to its limits.
@Gkinghrn something you could try…
When I used to fly with my old iPad Mini 2 using GO4 I’d often get those warnings. Turning off the local video caching really helped. It seems that tipped it over the edge.
Worth a test with DJI Fly as it could be an easy fix for your issues.
Go to:
Settings > Camera > Cache When Recording