My blackberry curve ALWAYS freezes and its fairly new, any experience?

I just got a Blackberry Curve in august. Its a great phone and does a lot of different tasks but everytime i go to add/edit a contact it freezes and I have to take the battery out and reboot it. Also, theres a button on the side thats a navigation button. I never use it but everytime I press it by accident it won’t let me put it on stand by anymore then I have to take the battery out again and reboot it. Does anyone have any idea what could be wrong or what I could do?