Problem In My Network

Dropping this here to see if anyone has any ideas, here is the scenario. The local network runs out to a switch and then to a router.

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This has become a problem in our network for about a year now, the issue cannot always be replicated. We have person "A" connect to a CAT6 ethernet port in their office, everything works like a charm. Person "A" then moves to a conference room and connects to the ethernet port in the conference area, they then cannot get an IP address until they move back to the previous working port in the office. Person "B" then connects to the port in the conference room and it works fine.

This happens on various ports, various computers, and various people.

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We eventually had enough and changed out the switch, thinking this may be some sort of arp cache issue. The issue still remains.

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Now I have a wifi router "A" and wifi router "B", wifi router "A" works perfectly in the port it is in. Wifi router "B" does not receive authentication signals in any other port except for the one router "A" is plugged in to. Maybe related, maybe not.