Several users have reported that their device refuses to charge if it has been idle for a while. Some charge only if the display is "woken up".
Video blogger Lewis Hilsenteger dubbed the issue "chargegate" in a video demonstrating the problem.
However, Apple has not yet commented on the issue.
Mr Hilsenteger presents the Unbox Therapy channel on YouTube, which has more than 12 million subscribers.
In a video published on Saturday, he tested nine iPhones by plugging them into an official Apple power supply.
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