Why does lease expire in this configuration?

I configured a dlink wireless IP camera on my network the following way:  Camera to receive an IP address via DHCP.  WPA2  selected and pw was entered. 

On my actiontec MI424WR-GEN3I I set a reserved (static) address for the camera for the wireless mac code as 192.168.1.10. 

I restart camera and routers, and in the router connection list,  I see the camera with a lease, and everything works fine.

Comeback later and the camera does not work, check the connection list and see the lease has expired!

What causes this and how can it be fixed?  I want the camera to have a static address....I can configure the camera to have a static address, but would that fix it? and if so, what do I need to do on the actiontec side???

Thanks

J