2 routers on one network

I have connect 2 routers to extend my network to an exterior building. I have done the usual steps. Reassigned the IP address of the second router to be 1.2 and the first to be 1.1. I have disabled dhcp on the 2nd router. Assigned different wifi channels at opposite ends of the channels for the 2 routers so they don't interfere and then put the Ethernet cable going from lan1 in the first router to lan1 in the 2nd. But my internet now drops constantly on both routers for split seconds.

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Clarification Request
I've set this up hundreds of times

And never found the routers to be the cause. Check one thing though. Be sure the router firmware is up to date.

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Just upgraded

Just upgraded the firmware of the 2nd router so waiting to see will it drop. But would the firmware of the 2nd router (the AP) effect the 1st router?

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There's old bugs in routers such as the Vista (OS) that would cause routers to go offline. Some called it a Windows bug but it was simply the routers weren't ready for someone to use the broadcast flag.

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Firmware upgrade didn't work

I can confirm I have upgraded both router firmwares and it didn't resolve the issue. Is there any other common causes for the dropping? I have tried selecting channels at opposite ends of the list and not including the router IP addresses in the dhcp although that shouldn't matter when the ips are static anyway

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The most common causes.

You can find more on the web but my experience is Torrent use, old routers, ISP issues and overheating routers.

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