I'm noticing a volume bar on my phone even when I'm not pressing any buttons—the sound keeps turning…

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I'm noticing a volume bar on my phone even when I'm not pressing any buttons—the sound keeps turning off. I try to raise the volume with the up button, but it goes back down. Restarting didn't help. Do you think I should consider getting a new phone?
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Aleksandra
Take it to a workshop; they’ll clean the button, and it should stop sticking.
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Rimma
Perhaps it's a virus.
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Rimma
There seems to be dirt around the button.
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