The access point (AP) receives power through Power over Ethernet (PoE). If a power adapter is connected to the DC port next to the link light LEDs, remove it so the AP is powered only through PoE. If no adapter is present, continue to the next step.
The AP should have a cable connected only to the WAN/POE port. If a cable is connected to the LAN port, disconnect it. If the issue continues, proceed to the next step.