That happened to me look at the top of screen see uf u have an icon with a headset on it. If u do u need to turn off the seeting for hearing aid . After i did this crackling sound was gone ..
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Ive had mine for two months now and i love it !! Ive had few times where it started lagging just go to task manager then ram manager and then clear memory and wala lag is gone great tablet great price! !