Can you get an upgrade if the EnV touch randomly resets itself and decides to be idiotic?

I purchased an EnV touch probably in Febuary of 2010. The screen decided to randomly turn off about every day. It also turns off when I click in the web browser to search the web and when I use some "applications." The screen also freezes up and turns white and sometimes green. Sometimes the touch screen doesn't even work. Is it possible to get an upgrade/ a refurbished phone without purchasing a 2 year contract? My plan is with my parents and they prefer not to change our plan and I would like not to spend $400 or so for a phone.