WRT54G2 V1 has on and off, unreliable, internet connection since Saturday

Wireless router does not allow 2 macs and 1 of our iphones to connect to internet, but does allow another mac laptop and iphone in the family to connect... extrememly annoying and frustrating! All was working fine until Sat pm. The Airport connection on the desktop mac G5 and MacBook Pro both have an airport connection with message saying something about "self-assigned ip, may not be able to connect to internet." The other 2 (an iphone and another MacBook Pro) have been lucky and have not had any issues.  
Restarting the router works for a little bit on the items having issues, but then it cuts off the internet again.
Have been to the Apple forums and have seen the same issue there and thought I would do my own test to see if it was possibly the mac system software or the modem- brought the laptop with the connection issues to Panera today for lunch and the wifi worked fine there so this says to me that the modem is the problem.
Came home and updated the firmware to the latest version (from March) but seems the issue still exists!
Seems to be others having this issue here on the Linksys forums as well...
Linksys what is your resolve for this?????
Message Edited by kanscho on 06-22-2009 08:51 PM
Solved!
Go to Solution.

After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch.  If you have not done this since your last firmware upgrade, please do this now and see if it corrects your problem.  If you saved a router configuration file, DO NOT use it.
To reset the router press and hold the reset button for 30 seconds...Release the reset button...Unplug the power cable from your router, wait for 30 seconds and re-connect the power cable...Now re-configure your router...
Also make sure that your computer is set to obtain IP automatically, disable any firewalls, security softwares on the computer before trying to access the setup page...
If your Internet Service Providor is Cable follow this link
If your Internet Service Providor is DSL follow this link
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type - 192.168.1.1 and press Enter...Leave username blank & in password use admin in lower case...
For Wireless Settings, please do the following : -
Click on the Wireless tab
- Here select manual configuration...Wireless Network mode should be mixed...
- Provide a unique name in the Wireless Network Name (SSID) box in order to differentiate your network from your neighbours network...
- Set the Wireless channel to 11-2.462GHz...Wireless SSID broadcast should be Enabled and then click on Save Settings...
Please make a note of Wireless Network Name (SSID) as this is the Network Identifier...
For Wireless Security : -
Click on the Sub tab under Wireless > Wireless Security...
Change the Wireless security mode to WEP, Encryption should be 64 bit.Leave the passphrase blank, don't type in anything...
Under WEP Key 1 type in any 10 numbers please(numbers only and no letters eg: your 10 digit phone number) and click on save settings...
Please make a note of WEP Key 1 as this is the Security Key for the Wireless Network...
Click on Advanced Wireless Settings
Change the Beacon Interval to 75 >>Change the Fragmentation Threshold to 2304, Change the RTS Threshold to 2304 >>Click on "Save Settings"...
Now see if you can locate your Wireless Network on your MAC and attempt to connect, when you are prompted for Password, enter a dollar sign and then enter the 10 digit WEP Key1 and check the box that says 'Remember password in my kechain'. This should help you stay connected to your Wireless Network even when you restart your MAC...

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