^^ Those are all very good suggestions. Could very likely be the button itself. Might try a toothbrush does in rubbing alcohol for that.
Go into settings and see if there is an iOS update available. iPhones are becoming increasingly more glitchy these days. Updates typically show up with a badge notification, but not always.
Also try a "simple" or "soft" reset. It's a surprisingly little known technique one had to know back in the iPod days that will reset your device without erasing everything.
Hold down the Home-App Switcher-Siri-Accessibility ·BUTTON· + Power ·BUTTON· at the same time and hold them down for 10-15 seconds. This works when an iPhone/freezes and the power button alone won't work.
Good luck. If that doesn't work try Apple customer support. Despite being more than sick of Apple, I must admit they have excellent customer support.
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