iphone 5 will not stay connected to wifi

If the issue occurs with multiple networks, it might be a hardware defect.

Have you tried troubleshooting steps in this article? http://support.apple.com/kb/ts1398

If that fails, you could also try restoring the device as new. If that doesn't solve the issue, the device may need service.

Follow the steps in: http://support.apple.com/kb/HT4137

NB: set up as a NEW device because a software issue will be in the backup. If the issue persists after restoring as new, you should offer the device for service.

Good luck 🙂

Try restoring you iPhone by holding both the lock and home button for ten seconds and connect to iTunes and follow onscreen intructions. and/or. Go to settings>general>reset then reset network settings. That ussually does the trick for me.