Help with WRT5G Wireless router networking (IRAQ)

Hello I am currently in Iraq and am having great difficulty with my wireless network. The network is set up as follows. We have a sattalite that goes straight into our cable modem. From the cable modem to A linksys WRT5G wireless router. From this wireless router i have 2 other wireless routers linking off of this one. I have the line from the cable modem to the internet port in the first wireless router. The lines going out of the first wireless router are going into port 1 in the other two wireless router. I have a static ip in the first router and it is setup as a gateway. The other two wireless routers are setup as DHCP and as routers under the advanced settings. Is this correct the correct settings and/or the correct way to wire them? The first router keeps restarting and stops transmitting a signal. I have changed routers so i know that it is not the router itself. I have no idea how to fix this problem and our internet is key for morale in the barracks..everyone relies on me as a gateway to family back home. If anyone could give me any suggestions as how to set it up correctly or perhaps improve the situation that would be awesome. Any help is appreciated. It seems that when the router is up it works ok..but will only work for 15 minutes top, before the wlan lite goes out..and it stops transmitting a signal...i am lost. Please help.