Looks like a driver bug then. GPU overheating or PSU problems.
But also this, from your log:
INFO: Some foreign modules were found injected into outerra.exe. Note that these modules can interfere with the rendering, causing black screen or rendering artifacts. It's advised either to stop the programs or unload them.
The following potentially problematic modules were found:
I:\@_Programme\@_Internet\FritzBOX\sarah.dll (AVM Berlin, AVM Products), version 3.09.07.2001
I:\@_Programme\@_Internet\FritzBOX\block.dll (AVM Berlin, AVM Products), version 3.09.07.2001