Well, after some hours trying to solve the issue, i found the trick ! (it does work for me on a Lenovo with a BCM4312)
Uninstall completely bcmwl-kernel-source ! (seems buggy)
Install instead "b43-fwcutter" and "firmware-b43-lpphy-installer" (for BCM4312), or the others BCM installers according to your type of BCM.
Reboot => done ! No more "wl continuously spams syslog" and my wifi is stable and strong now.
Well, after some hours trying to solve the issue, i found the trick ! (it does work for me on a Lenovo with a BCM4312)
Uninstall completely bcmwl-kernel-source ! (seems buggy)
Install instead "b43-fwcutter" and "firmware- b43-lpphy- installer" (for BCM4312), or the others BCM installers according to your type of BCM.
Reboot => done ! No more "wl continuously spams syslog" and my wifi is stable and strong now.