Draw your network topology....

after around 12 hours or less of uptime the NAT is down, i can't download anymore with 23 MB/S only 11 MB/S, Sounds like you are running bittorrent or other BT download. I want to say 11 MB/S is...

WPA2-PSK / AES Group Key Update Period: 0

Log into the TL-WR741ND, navigate to wireless --> wireless security to set up password for the WR741ND's WiFi

1. Besides this WR841N is there any other router/access point/range extender in your network? 2. How does it recover every time the problem occurs? 3. Better upgrade the latest firmware

To be honest, this makes no sense. i get your idea about multiple BSSIDs for the same SSID so that the clients can roam among the SSIDs and pick up the strongest BSSID to connect. But the...