Wireless sometimes cant see a particular modem

Hi,
Maybe this subject was discussed here before but I couldnt find any related topic. Here is the problem: Sometimes I can reach a particular modem for 3, 4 hours which uses WEP, but after that I lose my connection and even cant see that modem anymore.  Infact there is no problem with Networkmanager, I can see other wireless modem but that particular modem wasnt seen by my laptop. How can I fix this problem or which log helps me to figure out problem?
Thanx.

Nothing, mate...
Firefox can't establish a connection to the server at 192.168.1.1.
* The site could be temporarily unavailable or too busy. Try again in a few moments.
* If you are unable to load any pages, check your computer's network connection.
* If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

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