Blocks.sh exits unexpectedly on Linux: FUnixPlatformMisc::RequestExitWithStatus() called

[kp368]

HI,

I have pulled the Blocks.zip binary on Jan 18 (it is still the latest). I run it on a headless Linux server, with nohup. However, every now and then after a few hours it crashes and here is what I see in the log:

....
[2021.04.29-13.02.55:698][ 0]LogRHI: Using OpenGL program LRU cache: 0
[2021.04.29-13.02.55:698][ 0]LogContentStreaming: Texture pool size now 1000 MB
[2021.04.29-13.02.55:715][ 2]LogRenderer: Reallocating scene render targets to support 128x128 Format 10 NumSamples 1 (Frame:0).
[2021.04.29-13.03.35:238][485]LogRenderer: Reallocating scene render targets to support 256x144 Format 10 NumSamples 1 (Frame:1).
FUnixPlatformMisc::RequestExitWithStatus
FUnixPlatformMisc::RequestExit
[2021.04.29-15.27.32:017][457]LogCore: Engine exit requested (reason: EngineExit() was called; note: exit was already requested)
[2021.04.29-15.27.32:018][457]LogAudio: Display: Shutting down audio device while 2 references to it are still alive. For more information, compile with INSTRUMENT_AUDIODEVICE_HANDLES.
[2021.04.29-15.27.32:090][457]LogInit: Display: PreExit Game.
[2021.04.29-15.27.32:108][457]LogWorld: BeginTearingDown for /Game/FlyingCPP/Maps/FlyingExampleMap

Looks like it was running happily but then RequestExit was called after an hour and a half.
I cannot figure out what is calling RequestExit...Any pointers to where to look?