iPhone 7 and iPhone 7 Plus produces hissing noise when it overloads?

There is now a
little controversy in the new generation iPhone 7 and iPhone 7 Plus which
produces some kind of hissing noise when it overloads like when you are using
lots of apps, games in the background. Some iPhone 7 and 7 Plus owners reports hissing
sound came from their devices. 
Though it’s not a big deal and it doesn’t affect
the device but Hackett said on Twitter that Apple will be replacing his device
with a new one as it appears that Hissgate only effects a small number of
So is that the real issue? Does your device making the hissgate? 
us know in the comment below..