I am getting a similar error using the BCM4313 card on our Acer Aspire
One 722  netbooks running 12.04. They see the network and connect using
the brcmsmac driver, but will occasionally stop being able to transfer
over wifi. Network manager says the netbooks are connected and they have
an IP address, but they cannot ping anything. That lasts for about a
minute and then they can load webpages again. It seems to happen under
heavy network load on the device (but not on the network at large).
Running dmesg | grep iee shows that it is constantly reporting the
following info:

[  637.012316] ieee80211 phy0: brcms_c_dotxstatus: INTERMEDIATE but not AMPDU
[  637.012533] ieee80211 phy0: brcms_c_dotxstatus: INTERMEDIATE but not AMPDU
[  645.588396] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: true 
(implement)
[  648.650949] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: true 
(implement)
[  649.676131] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: true 
(implement)
[  650.595325] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: true 
(implement)
[  654.590220] ieee80211 phy0: brcms_ops_bss_info_changed: qos enabled: true 
(implement)

This error and the messages only appear on our school network. The
netbooks work fine on my home network and don't have those log messages.
Our school network does use qos for VoIP, but I am not sure why that
would have to be reported over and over again. Also I don't know what
the AMPDU message is about at all. The same netbooks with an Atheros
card have no issue connecting and staying connected, so it seems like an
interaction between some aspect of our school network and the BCM4313
card in Linux.

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https://bugs.launchpad.net/bugs/941695

Title:
  Broadcom BCM4313 random AP disconnects and network hang

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