As impressive as the iPhone X is, its performance has certainly been under scrutiny.

Now there's a new issue to add to the list, as dozens of iPhone X users have reported that the front-facing earpiece speaker is making crackling or buzzing sounds when used at high volumes.

The reports, which are mostly on MacRumors and Reddit, vary a little in terms of what triggers it and at what volumes, but broadly it seems that any type of audio can cause the problem and some users report it kicking in even at around 50% volume, so it doesn’t have to be super loud.

It’s unclear how many users are affected, and given the likely millions of handsets in the wild it’s probably a very small number, but far from an isolated issue.

We thoroughly tested the speakers on our iPhone X unit during our review period and found them to be powerful and punchy, with no hint of a crackle.

We also re-ran the tests as a result of these claims over a variety of tracks and found no crackling ensued.

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