Uverse + Asus N56U router drops connection randomly

Hi there,

This problem has been bugging me for months, and cost me days of searching for a solution, but so far I haven't found one. This is the last place I can resort to, which is why I registered here today.

The problem: I have Uverse internet, not sure what the model of the modem is. I use Asus RT N56U in access point mode to use wifi. The wifi on the Uverse modem is disabled. The configuration on N56U router is automatically set to AP mode. Everything works just fine except the router drops connection just randomly, usually every day or two days. The symptom is that the wifi is suddenly disconnected, and cannot be re-connected. Even I try the wire, the connection to the router is not established. But other devices that are wire connected to the Uverse modem still work fine, which means the modem is still working properly.

When the problem first appeared, I searched the internet and thought the problem was in the DHCP part. In my original setting, the range of Uverse modem DHCP was 192.168.0.64-192.168.0.253, and the Asus router was automatically assigned to 192.168.0.67. According to the posts that I saw both here and elsewhere, I should change the router's IP out of the DHCP range of the Uverse modem. So I logged into Asus router and changed its IP to 192.168.1.1. But the problem persists.

The only solution I can do now is to unplug the router and then restart it. It will work for a day or two, then it will just randomly disconnect again.

Any diagonose of this problem? Thanks a bunch for your feedback.