I've got a 4965 (Dell D830, 9.04) and a Linksys WRT610N. With it, I set
up both 5GHz and 2.4GHz networks. My machine doesn't stay much longer
connected. The 5 GHz network should save me from interference, but I
keep jumping from one to another, to no avail. The simplest test is to
transfer a large file, which will inevitably cause network hangs.
Network manager sometimes recovers itself after a while, but at other
times I have to progressively resort to reselecting either of the
networks, disabling/enabling wireless, disabling/enabling networking and
sometimes only a reboot will do it. I found that keeping a shell pinging
the wireless router (or any other address) helps somewhat, stretching
the up times. Mind you that I mostly use NFS inside my network, but not
only.

This is a fresh install from yesterday, since the upgrade from 8.10 to
9.04 was presenting so many problems on key issues (wireless, suspend,
kernel panics that I never had before since 2000 on various linuxen).

An interesting info is that I had this wireless problem on 8.04, gone
with 8.10 and now back on 9.04. I don't recall precisely the timing, but
I guess it more or less matches upgrades/reinstalls of Ubuntu versions.

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[Jaunty] Intel wireless 3945ABG is unstable and disconnects frequently
https://bugs.launchpad.net/bugs/348204
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