What is going on with my IPhone? - 2

I have an IPhone 5 and just recently this weird thing started happening.
When I open my music and click a song, it plays the song right before it rather than the one I clicked. It only does this when I'm selecting a song which is confusing me. I've tried turning my phone off and back on (I can't restart because my lock button is broken and assisted touch won't do that), and syncing it with my computer. Does anyone know what is wrong/ how to fix it or am I just better off taking it to the Apple store and seeing what they can do?

What you can try to do which might resolve your problem is a factory reset. First back up your phone. If I were you would sync with icoud and with your computer just to be safe. Then go to settings<general<reset<erase all content and settings.

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