Changing your DNS is not the same as using a proxy or a VPN. All 3 are different things. That said, some VPNs do have their own DNS. DNS is just the system used to fetch websites, i.e. when you type...

TL;DR Internet keeps disconnecting and reconnecting when using TP-Link (both when hard wired and when connecting to TP-Link via WiFi). Model: TP-LINK 300M Wi-Fi Extender Booster & 600MBPS Powerline...