when running 
$ rfkill list all
i get: 
0: acer-wireless: Wireless LAN
    Soft blocked: yes
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes
6: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

When running:

$ rfkill unblock 0

I can enable wifi again.

Any idea why this is occuring, and what I can do to fix it permanently?

-- 
iwlagn degrades quickly during normal wifi session
https://bugs.launchpad.net/bugs/630748
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