Ubuntu Networking :: Wireless Repeatedly Stops Working On HP Pavilion/Intel 4965AG/Karmic

My wireless LAN connection on this machine occasionally stops working. The network traffic bar shows periodic very small transmissions but the failure of all network dependent applications (Firefox, package manager, etc.) indicates to me that the machine is no longer talking to the net. I can fix it by reselecting my home network in nm-applet from the drop-down list. This causes the machine to disconect, reconnect and all is well for some random period of time thereafter. Here's some data:I'm running an HP Pavillion laptop.

Code:

~$ lspci | grep Wireless
02:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

Code:

~$ lsmod | grep iwl
iwlagn 124768 0
iwlcore 134820 1 iwlagn
mac80211 243496 2 iwlagn,iwlcore

[code]....

I don't know if this is related or not, but a couple of months ago I unsuccessfully attempted to share a hotel's wired Internet connection over my wireless card. I may have hosed some settings or it could be unrelated.The "unknown interface" portion of the restart attempt is interesting but I don't know enough to fix it.