Q: iPad Air freezes and reboot over and again

Was this just after you updated to iOS 9 or did this just happen randomly. Choose which one suits you.

Happened randomly:

I suggest that you try this out:

Remember before you try these to turn off Find My iPhone/iPad/iPod

(Settings>>iCloud>>Find My iDevice>>Toggle Off)

•Reboot (Hold home button and sleep button down for 10 seconds)

•Restore From Backup

•Restore As New (This will delete all the content on the device).

Just after updating to iOS 9

iOS 9 Freeze

There is a bug when updating from iOS 7 to iOS 9 (Skipping iOS 8). Luckily it is easy to fix!

Several Possible Solutions for Slide to Upgrade Problem

I Suggest that you view both videos.

Here is Apple’s recommended fix: If the Slide to Upgrade screen won't go away after you update to iOS 9 - Apple Support.

Here are two YouTube videos that you can try:

     How To Fix '' Slide To Upgrade '' Stuck - ios 9 - YouTube

     #IOS9 Bug - Slide To Upgrade / Apple Fix It - YouTube

Step 1 - Backup your device (This will save things like photos, text messages, etc).

Step 2 - Download iOS 8.4.1 for your iPhone or iPad.

Step 3 - Reboot phone into DFU mode - hold down the sleep/wake button and home button - when it reboots let go of power button - still hold home button

At this point it will ask you to connect your phone to iTunes - will have to connect phone to the computer.

Step 4 - Hold down the Option (Mac) or Shift (Windows) and and then click restore.

Step 5 - Browse to the 8.4.1 file you downloaded and select it. This should restore to the previous IOS version. Note: This will wipe phone.

Step 6 - Restore from backup. Hope that you backed up before attempting to update.

Step 7 - Download and install iOS 9.

More information can be found at: https://support.apple.com/en-us/HT205239