14e4:4331 [MacBookPro9,2] b43 driver drops connection very often

[UrkoM]

Ubuntu 14.10 installed on Macbook Pro 9,2, with Broadcom 14e4:4331.
Using b43 driver, connection randomly drops, and only way to recover is shutdown and reboot.
With Mac OSX, same network, connection is absolutely stable.

Network is using WPA2-AES Personal, with Ruckus access points, 802.11g and 802.11n.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: firmware-b43-installer 1:019-1
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Fri Oct 31 16:13:13 2014
InstallationDate: Installed on 2014-10-11 (19 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
PackageArchitecture: all
SourcePackage: b43-fwcutter
UpgradeStatus: Upgraded to utopic on 2014-10-22 (8 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.