Had the same problem and saw many "Tx aggregation enabled on ra" errors in
syslog.
The suggested workaround ("options iwlwifi 11n_disable=1" in
/etc/modprobe.d/iwlwifi.conf) seems to fix this.
OS: Ubuntu 12.04
Kernel: 3.2.0-60-generic
Computer: Lenovo Thinkpad Edge 14
Wireless Card: Intel Centrino Wireless-N 1000
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https://bugs.launchpad.net/bugs/974838
Title:
Wireless Dropout - Tx aggregation enabled on ra (workaround: iwlwifi
requires 11n_disable=1)
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