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My Oppo A1K phone goes off by itself and, when turned on, cannot stay for more than a minute. It behaves that way whether the power is full or low. Kindly help.

Hi, Does it do this with the charger connected? If not, try replacing the battery and check if that resolves the problem. Here’s a video that shows what to do. Replacement batteries are available online. Just search for BLP-711 battery to find suppliers that suit you best.