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I bought this phone and it happened to.me also, they store gave me a new phone instead and it had the same problem. So i returned it and since i like the phone and my only issue is the problem I wend to a different store and bought the same phone redmi note 5. And it has the same problem which the volume bottoms stop to work, and after a restar they are back. This is very frustrating. Dont know what to do. FYI during the period i had 3 software updates which didn't help