I too tried wicd and get the same problems. so it looks like it's not a
network-manager issue, but either a wpasupplicant or a kernel driver
problem.
** Package changed: network-manager (Ubuntu) => wpasupplicant (Ubuntu)
** Changed in: wpasupplicant (Ubuntu)
Status: New => Confirmed
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wireless network has problem connecting and sometimes disconnect
https://bugs.launchpad.net/bugs/569841
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