In my experience using a VPN (Mullvad) it’s a DNS problem. Sometimes after disconnecting from the VPN I have to manually edit /etc/resov.conf and add a nameserver. Look into /etc/resolv.conf and see if there is a nameserver specified, if not just use:
nameserver 1.1.1.1
After that restart networkmanager:
sudo systemctl restart NetworkManager.service
To me also potentially points to a faulty VPN installation, which I came across troubleshooting on this forum before. But you still may be right.
I hope one of us has the right diagnosis. 
Pudge
I have just reinstalled OS, now it works flawless again. Thank you for all your suggestions. Have a great day!
Sure? Not that I ever decline an offer for a drink, be it virtual or in reality, so here’s to you, @Pudge 
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