I have same problem.
Since updating iOS to 18.1.2 on my iPhone 12, the Tello app closes suddenly every minute.
And updating to iOS 18.1.3 does not solve the problem.
I had to use old iPhone to make flight without the problem.
I flew a drone a few years ago and wanted to fly it again after a long time, so I chose tello.
I usually fly it inside the house and outside when it gets warmer.
Best regards