ipad 2 Digitizar sticky

[eng.sameh]

hello
guy i have an ipad 2 i bought it from us store in jan. 2012 so i would like to ask something
my ipad 2 has never been repaired its working well , but today i was checking the digitizar i found it sticky from all ipad sides so when i push it down it doesn't make sound so there's no vacuum but i mention that when i push the digitizar from the place of the volume controlor and the mute button it makes a little bit sound ( there's vacuum inside or this area is a weak area on the ipad )
so i would ask anyone have an ipad2 to push on the digitizar from the place of the volume controller & mute button is there any difference from pressing on any other area on the digitizar ?

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[eng.sameh]

hey. ................