iOS apps continue to use CPU after iPad sleeps

i've created several air -ios apps ipad , have noticed after ipad sets sleep, these apps continue use % of cpu indefinately, (around 2%).

 

i'm seeing using xcode instruments activity monitor whilst ipad connected.

 

the apps have been created with:

flash pro cs5.5

air 3.2

 

tested on ipad1 , ipad2.

 

would know if there there reason this, causing , there fix?

 

thanks,

 

mark

 

update:

 

allowing ipad sleep maintain cpu usage of around 2% air apps, whereas closing app home button sets cpu usage 0, app not exiting on suspend.

 

when native app running when ipad sleeps cpu usage return 0%.

 

i wonder air app doing?????

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