My Note won't shut down. Please help.

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http://forum.xda-developers.com – Hi All, I just received a brand new Galaxy Note II from T-Mobile. When I put in the battery, the phone automatically start up. After the initial setup, everything else seem to function normally. When I tried to shutdown the phone (hold power button for ~3 sec and seelct "Shut down"), it would shut down and restart again by itself. I tried factory reset, but that does not help. I hope I don't have to send it back to T-Mobile, and wait for a new one, Any ideas??? Thank you in advanced. (HowTos)