I bought mine at around 1 and have used it regularly with no slow down. I installed LauncherPro when I first got it, and it worked perfect. However, a few minutes ago, my phone just went black, aside from my topmost bar. I pressed the power button and nothing, so I took my battery out, and started it up again...and the same thing happened: black after a few seconds. It's happened 6 times in a row now. What do I do?