Limited Connections

We currently have a 5 access points connected through wireless bridges and we are able to see our wireless network at each access point. Our problem seems to be that once we have a certain number of clients connected, which seems to be around 10, no other clients can get an IP address. The DHCP server is set to use an entire class c subnet so we should have plenty of IP addresses to hand out.

Are there any settings that would limit how many clients can connect or what are we missing?

Thanks for any help