I have an original 128 GB / Cellular iPad Air which I recently updated to IOS 10.1.1. It was working fine for almost a week after the update, but when I let it run completely out of battery two days ago, the Wifi option is now grayed out. I tired power cycling, resetting the network settings (multiple times) and restoring from my iTunes backup to no avail. Is this a known issue with 10.1.1? What are my next steps, if any? I did not buy Apple Care, so is there any value taking it to the Genius Bar for analysis?