My home button is rotating?

I have an iPhone 5 and I got it right after it came out. I have got it for 2 years now and I started to see some changes in it. Around 2-3 months ago I had my power button repaired because it stopped working, and now my home button started rotating both ways when ever I slide my finger on the side of it. I stuck a piece of celetape on it in case I fell out. What should I do? And can it fall out randomly? Why is it doing that?

If you have had it for two years you can probably upgrade by now. My carrier has the 5C for a penny and the 5S for $50.

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