Connection problems through WiFi

I think it's quite a weird problem : I've a desktop in my house which is connected to the router by LAN and I've a laptop,a smartphone which are connected to the router by WiFi. This morning, when I tried to Google something from my laptop, Firefox showed me -



This not just happened with Google but with any other site and it also happened with my smartphone. But the funny part is that the downloads were just fine with torrent and IDM. Only I couldn't surf the net.

Note : The problem didn't occur with my desktop at all.With my laptop and smartphone, It automatically fixed a few hours later and happened again after a while.

I think that has something to do with your router. Whenever something like that happens to me, I restart my router and all of the other devices. Sometimes it happens to one device that is connected through WiFi, sometimes it happens to multiple. Home routers tend to sometimes go a bit dumb when you're torrenting something on a high speed internet connection, so it should be normal to restart it in that case. Even if it's a pretty old router and you have a pretty good connection and computers, torrenting will also confuse it.
Not knowing what is actually causing it to happen makes it impossible to solve permanently. If you're able to test your connection and do different things to it without having anyone else use it, maybe you can see the cause.

Restarting is the first thing I did.

Solution :

Changing my DNS did the trick.