Suddenly from nowhere can't resolve DNS?

If anyone can help me i appreciate!
Otherwise i'll may do a factory reset, or not?

I didn't see anything immediately obvious in my quick read through of your config.
Make a backup before you reset. Then run the reset and configure only the minimum things you need to get back up and running. Let us know what happens.

Hi

maybe for first run, let the WAN dhcp client pick the DNS IP from provider (obtain automatic DNS from provider)
Do not enter manually DNS settings

On the router side i never added manually the DNS, always got the automatic ones from ISP

Factory reset worked, now dns are working.
And the configuration is 1:1 exactly the same (both router and both Windows 11). No idea why all of the sudden it stopped working.
Maybe it's a firmware problem that after sometime dns randomly will fail?
I will monitor in these days

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I'm glad you've posted this, i'm having a similar issue with a Belkin RT1800. Dns was working great for a few weeks. Now it randomly drops out for a minute or so before springing back into life. I've upgraded the latest snapshot and factory reset but the same issue occurs.

I'm new to openwrt so thought it was something I was doing wrong. I've plugged my old draytek router back in until I can identify the issue.