Screen session dies randomly and how can I diagnose the reason?

I'm using a Python script with screen session but it dies randomly and I checked syslog files for an error (which mentioned on Screen and SSH Tunnel - How can screen session possibly die?) but couldn't find any error or something to diagnose the problem.

Is there any way to diagnose the underlying problem?

Note: I'm using Ubuntu 18.04.4, Python 3 for scripts.

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