- Is something going on at the ISP end that's causing your connectivity to fail?
- Is someone removing any connection at the remote end?
- Is there any string power source near by which is causing electromagnetic interference?
You can't go for a structured approach.
One of my customers used to have an OSPF breakdown every morning. On investigation we found out that security guards used to switch off the main power in the evening and switch it back on in the morning around 8 am. So the router used to start the OSPF process all over again and that used to bring the network down for a while.
Don't forget to consider even the weirdest ideas.
Best of luck.
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