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[Iván Stepaniuk <1256158@xxxxxxxxxxxxxxxxxx>]

I am seeing this same problem on a late 2013 retina macbook pro (11,1)
running Debian (jessie/sid) with Linux 3.14.13-2 (same BCM4360 chipset).
I am using the Broadcom driver from the Ubuntu repos, bcmwl-kernel-
source 6.30.223.141+b

I do not see any different behaviour between 5GHz or 2.4GHz. Tried both
on different APs. Maybe the title should be changed.

I also ruled out intereference, the driver reports a steady signal level
and link quality values when this happens, plus other stations in the
network work perfectly fine, including other identical Macbook Pros
running OSX.

As James pointed out, reloading the driver solves the problem, until it
occurs again.

As a side note, I also tried the Windows XP Drivers under ndiswrapper
(bcmwl5 version 6.30.223.228 obtained from the ASUS PCE-AC68 driver
setup) and it behaves in a surprisingly similar fashion. From 0 to 100
packet lost at random.

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https://bugs.launchpad.net/bugs/1256158

Title:
  BCM4360 High packet loss at 5GHz

Status in “bcmwl” package in Ubuntu:
  Confirmed

Bug description:
  I have an ASUS PCE-AC68 adapter (BCM4360 chipset), running under
  13.10, kernel 3.11.0-13-generic x86_64, bcmwl-kernel-source
  6.30.223.141+bdcom-0ubuntu1. The AP supports 802.11a/b/g/n/ac.

  The card and adapter work perfectly when connected in the 2.4GHz band
  and 5GHz low channels (36-48). When connecting at 5GHz high channels
  (149-161), there are no obvious errors, but packet loss to the gateway
  is extremely high (50-80%). This behavior is very bursty, alternating
  between no, and total packet loss on a timescale ranging from a few
  seconds to a few minutes.

  Power management is off, and syslog/kern.log don't provide any useful
  clues. Based on the observed pattern of the packet loss, and the
  performance of other 5GHz devices connected to the same AP, I don't
  think it is an interference issue.

  I'm unsure as to how to proceed with generating some more useful
  logging, so any suggestions would be appreciated.

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