Here are a few more clues from the first apport file:

NetworkManager[1220]: <info> (eth1): new 802.11 WiFi device (driver:
'wl' ifindex: 3)

NetworkManager[1220]: <info> (eth1): deactivating device (reason
'managed') [2]

NetworkManager[1220]: <info> (eth1): device state change: disconnected
-> unmanaged (reason 'removed') [30 10 36]

NetworkManager[1220]: <info> radio killswitch
/sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/ieee80211/phy0/rfkill1
disappeared

wpa_supplicant[1357]: Could not read interface eth1 flags: No such
device


Apparently NetworkManager deactivates the device for some reason. I'm not 
familiar with NetworkManager, let's ask an expert.

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https://bugs.launchpad.net/bugs/1287635

Title:
  [Broadcom BCM43142,  BCM4313] STA wireless driver failed to activate
  on 12.04.4

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