The iPhone 4S has been getting great reviews, but it’s also got a persistent problem — battery drain. Several users have noted that the 4S can run out of juice pretty quickly and, according to the UK newspaper The Guardian, Apple engineers have reached out to some 4S owners to try and identify what’s causing the problem.The report said that an Apple engineer had contacted at least one user to get more data about device usage and ask to install a monitoring app on the owner’s phone.

On Apple’s discussion boards, owners have come up with their own workarounds, which include wiping the phone and reinstalling all user data, disabling some alerts and notifications, turning off iCloud or Exchange updates and, courtesy of the idownloadblog, shutting off the auto-time zone setting on the phone.

Not all the solutions are working for all people, however, and some users on Apple’s boards are reporting that they’ve been told to bring their phones in for an exchange.

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