IOS apps continue to use CPU after iPad sleeps

I've created several AIR -iOS apps for iPad and have noticed that after the iPad sets itself to sleep, these apps continue to use a % of CPU indefinately, (around 2%).
I'm seeing this by using XCode Instruments Activity Monitor whilst the iPad is connected.
The apps have been created with:
Flash Pro CS5.5
AIR 3.2
Tested on iPad1 and iPad2.
Would anyone know if there is there a reason for this, what could be causing it and is there a fix?
Thanks,
Mark
UPDATE:
Allowing the iPad to sleep does maintain a CPU usage of around 2% for the AIR apps, whereas closing the app with the home button sets the CPU usage to 0, even with the app not exiting on suspend.
When a native app is running when the iPad sleeps its CPU usage does return to 0%.
I wonder what the AIR app is doing?????

Hi Peter, 
Thanks for your reply. 
If Ask to Buy is turned on, the organizer should have to approve new purchases, including free apps, before they are billed--either to the organizer's card or to the family member's gift card balance. 
The organizer must use a credit or debit card to pay for family member purchases. 
You can find more detail at these links:
Request and make purchases with Ask to Buy - Apple Support
When a family member initiates a new purchase or free download, a request is sent to the organizer if Ask to Buy is on.
How iTunes Store purchases are billed - Apple Support
 iTunes Store credit on your account isn't shared with other family members. So if the family organizer has a $50 credit on their account and another family member initiates a purchase, it won't deduct from the organizer's iTunes Store credit, but will bill the organizer's credit or debit card.
For additional clarification on Family Sharing, you may want to reach out to Apple Support using this link: 
https://getsupport.apple.com/GetproductgroupList.action. 
All the best,
Jeremy

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