Sounds like a hardware issue.
Verify it is not software by seeing if it occurs in safe mode.
If it does, it is a hardware issue, the warranty should cover it unless you dropped it and it is noticeable, otherwise it will be an insurance claim. Good luck.
Are you using a case? If so, check to make sure the case isn't holding the button down. If it is, then you will need to either get a different case or cut the hole in your current case a little bigger.
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