MacBook Pro forgets its wireless & network internet settings...

Hi...
I'm having problems with my MacBook Pro 'remembering' its wireless and network internet settings. I'm connecting via Airportto my Belkin 54g wireless router which is what has been running happily for the last 18 months.
Here's what happens - AirPort says it's connected, the internet works fine but when the MacBook Pro 'sleeps' or is restarted it 'forgets' its network and internet settings and cannot log on to the internet.
I get the Network Diagnostics appearing and I go through the options and eventually Network Diagnostics will show everything is fine, except there is no internet connection. I click through next options available on screen and I manage to get the MackBook Pro to restore its internet connection. All is fine until the MacBook Pro goes to 'sleep' again or is switched off.
This hassle began out of the blue - I haven't changed any settings on the machine, I haven't installed any software or anti-virus programs - it just spung up!
Any help or advice is greatly appreciated!
Thank you in advance!
philip

Hi,
I have not encountered this particular problem yet, but I have just bought a Belkin 54g adsl and wireless router. It has connected up to my home pc with no problems and it has also connected up to my macbook pro (leopard) okay, but the range on the internet connection is really poor. It works up to about 50 feet, but I can't use it upstairs, which granted is more than 50 feet away from the source, but at 80 quid I thought it would perform better.
I contacted Belkin support which is local rate and they suggested changing the wireless channel from 11 to 6, but when I did this it would even find the network using Airport.
I would like to be able to use the laptop over 50ft (i.e. in my bedroom) as well as all over the house, but so far I only get as far as the next room!
If anyone has any suggestions I would be grateful? NB: I am not a very technical user.
djmiz1

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