Hello,
today I also had the problem that the wifi constantly tried to activate without success.
I read some logs and found out there is some problem with the wpa_supplicant.
This is a file on your android system that is related to all you wifi passwords.
I followed the tips on this site http://forum.xda-developers.com/showthread.php?t=1450511
Moved the wpa_supplicant.conf , rebooted and voila, the wifi worked again. (you have to reenter all wifi passwords)
Hope this helps.
PS:
While I investigated the contents of the wpa_supplicant.conf I found this line
/data/data/org.fdroid.fdroid/files/fdroid/../swap-tick-not-done.png
Is it possible that all the people having this wifi activation problem have F-Droid installed? Could be interesting.
UPDATE:
I realized that even after the wifi worked again I couldn’t create an access point for sharing internet. After checking the logs I saw that there was a problem with p2p_supplicant.conf
As I checked the content it was the same like the broken wpa_supplicant.conf. Once removed AP worked fine again.
Is it safe to say that under some conditions F-Droid brakes the wifi functionality? Doesn’t happen to everyone that is sure.
If I have some time I might open a bug in their github, but the holidays are there soon 