Hello,
The logs do not indicate any network freezes or any abnormal behavior. Was it present during the file generation?
You could try configuring automatic modem/connection restarts to counter the issue. To do so, you need to login to router's WebUI, navigate to Services -> Auto reboot -> Ping/Wget reboot. Edit existing default or create a new instance. In its settings, enable it, set Action if no echo is received option to Modem reboot, adjust the rest of the settings to your needs or leave them as default.
This would be a workaround only though.
Would it be possible to arrange a remote via Anydesk, for you to demonstrate the issue and also look at your device to understand it better?
Best regards,