My guess is that you are having a problem with the internal wireless card in the lap top and not the router. The reason I say this is that I worked for a company and had my hands in supporting over 1000 IBM T-60 lap tops and had a lot of problems with the wireless cards in those units going bad. My thinking is that the T-40 and T-60 most likely used the same wireless card.
I would have to do some checking on the part numbers of the internal wireless to see if the same units were used in both models.
Here are a couple of things to try. Have a friend with a lap top come over and try connecting to your router and see the signal strengths. Move around the house and see how the signal varies. If your friends lap top works properly then the problem is most likely your internal wireless card. You and your firend could then try one of the WiFi connections within TV and see the differences and try to isolate the problem. Another thing to try would be to find someone that uses a USB wireless card and try that. Be sure to disable your internal card before using the USB wireless card.
Regarding your router it may have become overheated. When I was in the market for the router that I currently have I looked at the Linksys / Cisco and ran across some user comments that they were prone to overheating so I went with the D-link. Not sure if your model was one that was having those issues but it may be warm to the touch but not hot.
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