...well not really dead, the switch component of the router is knackered. I've had bad internet connectivity for a couple of days, most pages were timing out with failed connections.

Pinging was fine, 100% connectivity and no packet loss so network card is good.

Pinging router gateway was giving between 54% and 98% (WTF) packet loss so changed ethernet cable and still same result so cable is good.

Unplugged the router and connected cable directly to cable modem and rebooted both, to reset IP address and gateway, and hey presto full internet speed and no packet loss.

Wireless connection is still 100% fine too.

So new router shopping it is.

(that was 2 years of college well paid for)