Hello,
From the troubleshoot file it is seen that in 6 minutes there are 1112 packets dropped which are making me wonder if there could be a damaged ethernet cable.
It would be great if you configure the router to not only send E-mail but also SMS. Let's trigger input and check if SMS and E-mail were received. If you will get only the SMS notification, please ping 8.8.8.8 or 1.1.1.1 to check if there is an internet connection at that time.
Also, if the issue still persists while there will be an internet connection, it would be great if you could generate another troubleshoot file while replicating the issue, just, make sure that troubleshoot file is generated when the issue is present and before a reboot (So it can be seen in the logs). The longer device uptime will be while facing the issue, after downloading the TS file, the more information I will see which will let me identify what causes this behavior.
Regards,