Madeye1977,
After this I assume the issue immediately kicked in? If so this rules out third party coding causing an issue. It would also rule out a setting or other variable issue that could have been accidentally changed. I am beginning to think there is an hardware to software interface issue. Another thing to check is if there are any crash/diagnostic reports, Settings -> Privacy -> Diagnostics & Usage -> Diagnostic & Usage Data. If it's something noticed by the OS as an error it should be reported here.
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Varouqa,
This is very weird, and I am beginning to think it is hardware and software not playing nice together because on the iPhone 5 series 8.0 and above works. I surmise that they changed the interface card in these models, most likely to support 802.11 AC. Just a guess though since 5S does as well.
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Photographer333,
Have you had any wireless networking issues since you did this reboot?