She pulled up the TP-Link support archive on her second screen. There it was: . The release notes read like prophecy: “Fixed memory leak in DHCP snooping table. Improved stability under high ARP load.”
If you are using the TL-SG3428 with an Omada Controller, ensure the firmware supports the "SDN" mode. Some older firmware versions only operate in "Stand-alone" mode. Check the TP-Link compatibility list to ensure your firmware version matches the Controller version requirements. tl-sg3428 firmware