I was still in the staging process, so at that time all of the IAP's were connected to the same switch & in the same VLAN. The default-gateway & DHCP server was an Aruba 7005 being used purely as a router/firewall. Once converted to Campus AP's, the topology was the same & DHCP worked fine.
Initially I had all of the IAP's running at once. I could connect to the WPA2 SSID, but I was not getting an IP address. If I hard-coded the IP address on my laptop, I had connectivity, but was frequently getting packet loss.
Later on, I removed all IAP's & started over. This time I only added the IAP one at a time. They came up, but as soon as I changed the IAP to a static IP, I lost connectivity & had to reset them.