i have the same problem.Ill describe it anyways.
When my network disconnects for a long time (more than 2 mins. or so) then 
network manager cannot connect to the same network again without restarting the 
laptop or if i use the commands mentioned:

$ sudo /etc/init.d/network-manager restart
$ sudo restart network-manager

once i restart network manager by this method it reconnects.
I'm using a Lenovo r61 and have upgraded to 9.10 from 9.04 and this problem was 
not there in 9.04.

please let me know what additional information do i need to provide.

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wi-fi connection goes down - reboot is required
https://bugs.launchpad.net/bugs/154549
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