03-15-2013 04:51 PM
Hi and Welcome to the Community!
That sounds like a physical hardware problem...but to test, I recommend that you attempt to boot into Safe Mode:
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, see what happens.
If the behavior ceases, then think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
But if the behavior continues, then you may need to consider more drastic remedies. But, if you remain within your warranty period, I'd suggest you not bother any further with it and instead seek warranty support.
Good luck and let us know!