04-25-2013 03:23 PM
Hi and Welcome to the Community!
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 consider that you might have a hardware issue, which no amount of OS nor software can cure. Or, perhaps you got a buggy version or bad installation of the OS...you might try a clean OS reload.
Good luck and let us know!