>>>>>
>>>>>UPDATE. The problem was with xFinity modem. I reset it and all works now.
>>>>
>>>>rebooting is better most of the time. If you have not checked for firmware updates, after fresh reboot (best done disconnected) is a good time to enter the router software, reconnect router to the net and check for updates.
>>>>There HAVE been some problems fixed recently in some router models.
>>>
>>>Now THAT opens a can of worms. Routers are computers (often Linux-based), and like any other computer, should be periodically updated. Many residential/consumer routers quickly go out of support; many are never updated throughout their service lives. That makes them juicy targets.
>>
>>Have I been too poooolite ?
>
>I'm sure you're well aware of the security implications, but many are not. For lurkers there's a good overview at https://www.howtogeek.com/205299/how-to-ensure-your-home-router-has-the-latest-security-updates/ .

In the Beef / NetWork Chuck Spirit
https://www.youtube.com/watch?v=80vIin4xGp8
ticks the router settings and importance of router updates.
seems most concepts are correct and first steps taken
perhaps hardening all routers with DD-Wrt orOpenWRT is in order
(currently relying on different make/models and maker names deleted from net/device name)
- missing on the IDS IPS
so perhaps that is another option to take a look at

80vIin4xGp8