How should I configure a router, a bridge and an access point?

I have 3 routers connected like this:

• First one is the main router 192.168.1.1.
• Second one is the repeater connected to the first one via wireless WAN, acts like access point and router 192.168.0.1.
• Third one access point connected to the second one via cable 192.168.11.1.

It works fine, but sometimes internet drops off.

Please how should I connect the third router to first, the second one just bridging.

In which one should I disable DHCP and what DNS should I use?