* Apple released its iOS 11 update two weeks ago with a host of new features

* These include a redesigned Control Centre, more emoji and new Siri voice

* But users are reporting a significant drop in performance after updating

* The firm has already put out its second update, iOS 11.0.2, to fix more bugs 

Apple has released the second update for its new iOS 11 system, including a fix for the mysterious ‘crackling’ noise heard by some iPhone users.

After the new operating system rolled out two weeks ago, iPhone 8 and iPhone 8 Plus users complained of hearing a bizarre sound during calls and FaceTime, along with several bugs in the system itself.

The latest release, iOS 11.0.2, claims to fix the crackling issue and problems pertaining to ‘hidden’ photos and inaccessible emails.

Apple has released the second update for its new iOS 11 system, including a fix for the mysterious ‘crackling’ noise heard by some iPhone users. iPhone 8 and iPhone 8 Plus users complained of hearing the bizarre sound during calls and FaceTime

Several people reported they’d experienced the crackling issue on various forums.

'Strange thing is this noise happens randomly, roughly 1 in 3 calls. This is happening on iPhone 8 plus.'

The thread has dozens of replies from users who experienced the same issue.

In a statement last week, Apple said that the issue only affects a 'small number' of cases, but confirmed the company was working on a fix.

Now, the firm has issued iOS 11.0.2, which it claims will solve the problem.

Source: dailymail