Since migrating from iOS 8.3 to 8.4 (12H143) my iPad Air (ME987NF/A) looses regularly the wifi connection, a problem that didn't happen when using iOS8.3.
When the problem occurs - and while connecting to the Settings - I find that the iPad tries to connect to the known access point (an Apple Timecapsule) but does not succeed to authenticate.
The problem can be "overcome", by switching on and off the Wifi on the iPad, but reoccurs about an hour later (repeatedly)
My wifes iPad mini, which was not updated, does not experience the same problems.
Thus I suspect the problem can only be traced back to the new iOS.
When the problem occurs - and while connecting to the Settings - I find that the iPad tries to connect to the known access point (an Apple Timecapsule) but does not succeed to authenticate.
The problem can be "overcome", by switching on and off the Wifi on the iPad, but reoccurs about an hour later (repeatedly)
My wifes iPad mini, which was not updated, does not experience the same problems.
Thus I suspect the problem can only be traced back to the new iOS.