Ubuntu 11.04 
44:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)

Re-configuring my AP today, after my wifi 802.11n has been stable lately
i suddenly experienced problems, with connection loss.

The change that made the difference was on my AP.

1. Broken:  with only 802.11n on ap allowed.

2. Fixed: with 802.11bgn on ap allowed.

I connect at N rates 135meg+, but it seems the ap need to support bg for
the link to be stable to linux.

** Attachment added: "script to log wifi performance"
   
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/630748/+attachment/2173448/+files/pesWifiLogSpeed.sh

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https://bugs.launchpad.net/bugs/630748

Title:
  iwlagn degrades quickly during normal wifi session

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