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Question: Is there a feature that I can double tap to lock the phone?

Answer: Yes. We introduced this feature in our latest OnePlus Launcher (version 2.3.3, you can update it from the Google Play Store). By long-pressing on an empty space on the home screen to open the launcher options, select "HOME SETTINGS" and then you can find the feature option.

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Due to the flickering of fluorescent lamps, strobe problems occur when recording slow-motion videos using room lighting, which is normal behavior. We recommend using the slow-motion function in a bright, natural light environment.It’s normal, since slow-motion videos use a high frame rate (240fps/480fps). To ensure the high frame rate output, every single frame’s exposure time will be shorter than the frame of the preview photo. Especially in a dark environment, like indoors, the short exposure time will lead to a darker output.Feedback received. We add this option in the 5.1.6 update (20180607 build), please update your phone to the latest ROM available.Nice catch. The latest in the 5.1.6 update (20180607 build) supports it now. Please update your phone to the latest ROM available.Since the default date was 2018-1-1 when the phone shipped from the factory, it will show 140+ days since the last charge. When the phone is connected to the network, it will auto-correct the date and time. For example if you connect your phone on 2018-5-24, the time since last charge will be shown as 143 days. This phenomenon is normal and will be re-corrected at the next full charge.