What's wrong with my Apple iPhone 5c?

For the past week, my iPhone has had sort of a sticky power button problem. Whenever I lock the phone, the "slide to power off screen" shows up but goes away after a few seconds. How do I fix this?

Try resetting the phone or turning it off for a few and see what happens.

If you're still within your 1 year manufacturer limited warranty, contact your phone carrier and they will replace your phone.

Back up everything important like contacts, App list, photos, music etc.
Also download to your PC and install the very latest itunes so that you can do a factory reset (reinstalls the OS and makes it like a brand new phone). This is also needed if you forget the password… Always keep itunes up to date.

See the answer at the bottom of this page:
https://discussions.apple.com/...0?tstart=0

Apple is now fixing iPhone 5Cs for 149.99 (US dollars) either complete repair or a replacement as long as it's within your 1 year warranty