Hi Rugby!
Many thanks. I tried 1.1.1.1 and 8.8.8.8 directly in the DNS setting of ROCK/NUC but not on the router. I can try on the router, as well to be honest without expecting any improvement.
Regarding the firewall you may be right, the bad thing in linksys routers is that there are no settings allowing you to define firewall rules. You can either enable or disable the firewall without having any clue what it’s doing. I think I can take a small risk and disable them for a very short time when there is not much internet activity at home.
Enjoy The Music!
Emre