The issue has been resolved. Turned out 1 AP was causing the issue. We found it by shutting down each AP for 15 minutes and monitoring ARP traffic during the same time.I still don't understand how 1 AP (even if broken) can cause other APs, even the gateway, to send random traffic. Further troubleshooting found that while that AP was on, other APs were flooding ARP requests to each other. And the Cisco Firewall was sending ARP requests to random IPs.
Anyway, Thanks for your support, Herman.
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