Re: iPad Air losing internet
According to Mr Google who I asked: "How do you restore factory setting for iPad?":
Restore your device
Connect your device to your computer using the cable that came with it.
Select your iPhone, iPad, or iPod when it appears in iTunes.
In the Summary panel, click Restore.
Click Restore again to confirm that you want to restore your device to factory settings and delete all data and content.
Mr Google is great!