S6 edge connected to wifi but no internet access

So pretty much it says it's connected and it has full signal (because I'm sitting right next to my router) but the messages on whatsapp won't send until I turn wifi off and on again or connect to my second router and then to the first one again.

Why is it happening and how can I fix it? I googled so much but everything is either temporary fix (like connecting to other wifi network and then to first one again) or it doesn't work.

My S6 edge is running Android 6.0.1 unrooted

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