Airport can't connect to Router

I have a 2wire wireless router from AT&T , I am having trouble staying connected. I can setup the SSID and password connect and it will work fine , the next time I try to connect I get an error, I have to change the ssid and password on the router to connect again. What am I doing wrong, is there a fix?

Hello Dakine07...Welcome to the Apple Discussions!
Let's double-check your AirPort settings...
To setup AirPort for High-Speed Cable Internet connectivity:
System Preferences > Network > Show > Network Port Configurations
- Verify that an AirPort option exists. If it does not, click "New" to create one. - Verify that AirPort is "On" (checked)
- Verify that AirPort is at the top of the list. If it isn't, you can drag it to the top.
Systems Preferences > Network > Show > AirPort
AirPort tab
- By default, join: Automatic
TCP/IP tab
- Configure IPv4: Using DHCP
- Configure IPv6: Automatically or Off
Proxies tab
- Configure Proxies: Manually
- Select a proxy server to configure: <All proxies should be unchecked unless you specifically require a proxy for Internet access.>
- Exclude simple hostnames (unchecked)
- Bypass proxy settings for these Hosts & Domains: <leave blank>
- Use Passive FTP Mode (PASV) (checked)

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