Why does volume keep turning itself down on the Motorola Moto G (2nd Gen)?

My volume on my moto g 2nd gen keeps turning itself down from full volume to ¼ volume, I have checked everything but cannot resolve the problem, I have taken it back to the shop I bought it from but they have no idea what's causing it, please help. ????

My volume keeps turning itself down on my moto g 2nd gen, I have tried everything but cannot solve the problem, help. ????

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