2 routers problem

Hi
I have 2 routers and 2 wifiswitches.
1 Tp-link td-8810 adsl router and 1 linksys wrt54g2. Everything was working for 5 month but last month there was connection/no connection. And then all the settings from the tp-link router are gone.

All the settings in the tp-link are right. They come from the provider.

I've emailed linksys and did everything correct. I use the linksys as a gateway not a router!
The settings: automatic configuration DHCP, ip 196.168.1.222, subnet 255.255.255.0, DHCP server disabled, operating mote gateway, wireless wpa personal.

I pressed the reset button. Filled in all the info and there were no problems.
While I'm typing the router is asking for a new ip. Every 2 minutes  

I think there is an electric problem, because the red light (power) sometimes doesn't burn on the tp-link.
I told the owner of the tp-link but he doesn't believe me.
He told me that my linksys is the problem
Can the linksys wipe all the information in the tp-link router?
What can be the problem?
HELP