Grid mission stops shooting pix half way

I am using a grid mission with camera straight down to could wildlife for rangers in developing countries. The drone is an Anafi. During grid missions, the drone stops taking pictures after a while before finishing the mission. There is plenty of memory both in the phone and in the controller. Taking pictures manually works fine. Any ideas about what I do wrong? This is a very important tool for wildlife protection in Africa.
Thanks for helping out
Daan Vreugdenhil, PhD

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