iPad 2 w/3G microphone issue?

about month in using ipad 2 w/ 3g, noticed there problems recording using built-in mic. read couple of forum posts on apple support page , seems that hole builds dust , needs blown out or vacuumed out. others seems have received immediate exchange local apple store. seems problem 3g models , not wifi models.

has else experienced this? did decide vac port out every once in while or exchange , problem solved?

 

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