I have a 4-port wifi router (about 1 year old), and one of the ports has suddenly stopped working.

Connected to that port was a wifi repeater/AP that has two operating lights, viz. LAN and WIFI ... after the wifi stopped working on a computer I observed that the LAN light had gone out.  Swapped out ethernet cables 3 times, no joy.  Then tried another port and it works fine again, ergo dead port?

Can ports suddenly stop working?