While Apple has fixed WiFi in the latest system, WiFi remains unstable, frequently disconnected, and power consumption is much faster than previous versions (at least 10%).
iOS 8 has no minor problems and is not normal, before the foreign media even said that it has iOS history of the most bugs in the system.
iOS8.3 system WiFi still unstable solution
The first step, go to "settings"-"General"-"restore"-"Restore network Settings", will ask you to enter the password, then you can reset the network settings.
Second step, then continue to click "Privacy" in the settings-"Location Service"-"system services", dial "WiFi network" to turn off WiFi location service.
After the IOS device is rebooted, the WiFi can be wired more quickly.
If the upgrade is not stable after this method, we will have to wait for the official repair, this repair also do not know what is the month of the horse, anyway time is certainly very long oh.