I have 4 Cisco WAP551s at one of our sites, and I have discovered a problem whereby they stop distributing/passing through DHCP addresses to clients. This happens roughly every 2 days, at which point I simply reboot them all and magically the clients get addresses again and everything is OK for another couple of days.
I don't think it's the DHCP server (Win 2012 R2) since it still gives out addresses on wired clients when this problem occurs.
I have upgraded them all to the latest firmware and tried running them in a cluster (single point setup mode) and separately with the same SSID. Problem occurs in both modes.
If I give my wireless interface a static IP, I get full network access, so I don't think there's any routing/switch config issues.
Any ideas please? They're under warranty but I have no Cisco technical support contract. I could try get them all replaced but it seems unlikely to be a hardware fault with all 4.