@Joseph-TP I have diabled "private DNS" on my phone and DoT/DoH on the router is disabled, but the problem still persist.

@Joseph-TP I have changed the DNS now to 8.8.8.8 and 1.1.1.1, There are still issues with the 6GHz WiFi network. I get "Connected without internet," and when I open apps, they work for about 5-10...

I bought a new TP-Link BE550 WiFi router a couple of months ago, and at that time I had a Samsung S22 Ultra. After a few days, the phone started having problems using WiFi. I’ve tried using 5 GHz / 6...