I am not with Laminar Research; just a flight simmer.
Does your computer meet the specifications found at https://www.x-plane.com/kb/x-plane-11-system-requirements/ ? What are your specifications?
You should attach the Log.txt file for others with a greater knowledge base than me can try and solve your problem. This file is generated immediately after a crash or shut down.
You haven't indicated whether whether you are running a laptop or PC.
My first reaction is that your system is creating a lot of heat, as normal, in either the CPU or GPU and crashes unannounced , as you have indicated, because you don't have adequate cooling.
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