iPhone 5 volume buttons activating even if not pushed!

While listening to my music today, I noticed that the volum popup that shows what the volume is when you change it, kept popping up even if I wasn't telling it to.

It only happened a couple times at first, but then it was over and over again nonstop!

Does anybody else have this problem? Is it my phone? Is it a software glitch? Should I take it to apple?

Thanks in advance!

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