Hey Anton
We have done additional investigating and logged a report for it here: Unreal Engine Issues and Bug Tracker (UE-41970)
We didn’t have access to the Amazon Fire Tablet for testing but it does seem to crash on any devices with older GPUs such as the Mali 400 series.
You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.
Cheers,