I tried to post a longer, more descriptive question, but the spam filter wouldn't let me.
I have 2 routers. Before I disabled DHCP on the second router,most of the time the network would work, and sometimes it wouldn't. The client would get a "No Internet, secured" message.
Now that I've disabled DHCP on the second router, connecting to either network is fast and always gets a "Connected, Secured" status. But now I can't access the web interface of the second router. I've already read this question: Accessing a router which isn't a DHCP server
And I've tried accessing the router at its old IP (10.0.0.1), but its not responding, and factory resetting the router isn't an option.