Firmware 2.2.1.210 released as of 10/3/18

That's a great idea. Something very simple to try. (This is my first Netgear router but normally I use 8.8.8.8 for DNS, just forgot to do it when I got the router i november. I'll do that and see if it solves the problem before I change the lease time.

(although I was looking forward to using Telnet for the first time)
I am a novice in many of these issues but come to think of it, maybe some apps don't lose connection? (eg Netflix, uTorren that can manage without DNS while they have a "stream"). I should check that too.

Thx madhatter