In my opinion the source of the problem are the unneeded high frequencies for all cpus if some navigation app with GPS is running.
So you can try to tweak the CPU settings (but you have to root your phone therefore).
See also here:
https://forum.fairphone.com/t/are-random-reboots-processor-related/27519/2
And more detailed:
https://forum.fairphone.com/t/are-random-reboots-processor-related/27519/20
Tip: With Kernel Adiutor you can also create a “low” profile which you can activate before using the nav app. I have restricted the max cpu frequency to 1190 MHz for having a cooler FP2 and longer battery time while running OsmAnd navi app.
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