[toinejuan]

You could possibly try another store that has an authorized repair center. That's an option; or you could call on the phone to get a replacement but that would cost you $. I want to address what you said about the devices speed. There are a many, many, factors, it could be programs running in the background at startup, a data connection, accelerometer app, or just simply bloatware. Once you device boots, go into the task manager in the settings panel, check what is loading at startup. That should give you the information you need to find out why it is behaving so slowly. Just my 2 cents.