IPhone defaulting back to home screen, freezing and in a loop of rebooting/asking for passcode

iPhone 4, just over a month old, about 2 weeks into use has been playing up since.... I'm certain the problem is the same, but it manifests in different ways, usually daily. If unused for a period (as in an hour or two), the iPhone (when pressing the home button) goes to the black reboot screen, then asks for passcode, back to reboot, passcode and into an interminable loop.
Attempting to launch applications, or the internet, will just revert back to the home screen (as if the home button is pressed), or often, the home button will not work at all.
The onyl way of rectifying this is to shut off or - as this is sometimes not possible - screen and all buttons unresponsive - rebooting (holding home button & one of button)
I'm hoping it's a simple case of reinstalling something, or perhaps reverting to factory settings, but wonder if anyone else has experienced anything similar.

Hello Simmo1997,
Sorry to hear about your issue but let’s see if we can get your iPhone back up in running. If your iPhone is disconnecting when trying to restore then check out the article below to get you started with isolating the issue. Let me know if it gets resolved or if you discover a new symptom. 
iTunes: Resolve USB-related alerts
http://support.apple.com/kb/HT5772
Regards,
-Norm G. 

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