Recurrent internet drops at 10:00

[ColinTaylor]

I'm far from an expert on the subject, obviously, but from what I understand a CGNAT means that several users share the same public IP address. To allow communication with services outside the LAN, the CGNAT assigns different ports to each connection. Since the number of ports is limited, if all of them are in use new connections can be rejected. However, ports are released over time, so refreshing a page (like pressing F5 in a browser) may eventually work once a port becomes available?

It seems very unlikely as there are ways for an ISP to easily mitigate that potential problem. But anything is possible I suppose. I do still think this is likely an ISP issue though.

 

[Tech9]

turned off Wi-Fi

I suspect malfunctioning switch causing packet flood under specific conditions. The symptoms can be very similar to described. Just the opposite - I would test over Wi-Fi only to eliminate the switches.

 

[tgl]

Practically none of the theories suggested in this thread can explain why this happens only at a specific time-of-day. I am finding myself a little bit attracted to the CGNAT-overload theory, because if that's the mechanism then you could posit that some other user sharing the same public IP address has a workload that hits the net hard every day at 10am (for instance, a scheduled backup-to-cloud task, or some similar massive data transfer). Still, it would take a pretty incompetent ISP to not have noticed the repeated overload and done something about it, so that explanation isn't super satisfactory.