DNS is not resolved on 5Ghz network

So pretty much my ISP provides two different network connections, one for 2.4 GHz band and one for 5GHz band. The 2.4 GHz network works fine, but when I use 5Ghz network and open something like Google firefox just gives a random error.

However, direct IPs like cloudflare ( actually work, but still take upto 10 seconds to load. At first I thought it was an issue with the modem’s DNS ( but even after editing /etc/resolv.conf no luck. Also the direct IP connections themselves are very slow, it takes upto 10 seconds just to download a simple index.html. And this 5 GHz network works just fine on other devices. I think this may be after upgrading from 5.4 to 5.10 kernel, but can’t be sure because I hadn’t used the 5Ghz network for quite a while. Here is my wifi info-:

Network controller: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] (rev 10)

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