Please have a look at this solution: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1590985
Post #9

I had a similar issue after restarting a Lenovo thinkpad T520 (iwlwifi on a 
Centrino 6205).
After a cold start, not all the time. Sometimes I needed up to 4 restart before 
the wifi connexion succeeds.

The solution described in bug 1590985 solved both issues: 
wifi connection at startup _AND_ wifi restore after suspend.

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https://bugs.launchpad.net/bugs/1558252

Title:
  Intel 8260 / iwlwifi Occasionally unusuable after restart

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