Having the same issue in Precise with Intel Corporation Centrino
Advanced-N 6205 (rev 34).

B/G are fine. N works really well at first then plummets in speed to
less than 1 Mb/s and becomes unusable. Rebooting the router causes it to
work again (really fast), then it plummets again.

Using the iwlwifi 11n_disable=1 is the only way I can work wirelessly
with my router.

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https://bugs.launchpad.net/bugs/836250

Title:
  8086:4238 Intel Centrino Ultimate-N 6300 poor networking, packet loss
  and very slow Lenovo X201 and T500 laptops

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