Iphone 5c randomly mutes itself?

Recently my iPhone 5c has been having this problem where i would be listening to my music (original app) through my headphones and then suddenly the volume would get stuck and when i try to change it, all that happens is the volume bar flickers and the mute switch is on loud so it wouldn't be that. The only way to get rid of it is to turn my phone off then turn it back on again but it only disappears temporarily, and i'm not sure what's wrong with it
if anybody has the same issue or would know how to fix it that would be great thanks in advance

Lucy xx

Its broken

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