I think you should try advance option which hrangel shared with you VPN > OpenVPN, and select Enable VPN Server. you have to enable vpn server to resolve your issue.if you still face this problem...

I think its a router's issue. You should check your router's configuration first if still faces the same problem then i recommend you to call your ISP.

In LAN You will get the exact speed but if you connect your laptop or mobile with WIFI then you will see the huge difference between LAN and WIFI.WIFI signal fluctuates but if you are near your...