Ethernet wired connection keeps disconnecting

I recently got a Dell inspirion 5000 series but whenever I connect an ethernet cable it will disconnect from the internet for a second and reconnect regularly. Wifi is ok. It has been checked with different cables but the problem persists. An old laptop works fine. It seems to be a compatibility issue with virgin media, as I’ve now discovered it works ok with other internet providers. Tested the laptop with a neighbours plusnet and it was ok, another friends virgin media and it disconnects again! Does anyone have an idea what the problem might be? All drivers are up to date.