My Evo 4g will shut down on it's own and then it has a black screen. Every 10-15 seconds it flashes a white screen that says HTC Evo 4G on it. The only way to stop it is to power it off for a little bit or pull the battery for a few minutes. Even then when you restart it, it will continue to do that. Seems like it does it mostly after using it for awhile, like playing a game or on the Internet. I did a hard reset on it and then I took it to SPrint who did the same thing, even though I told them I already did it. Im having a hard time finding any answers. Any suggestions?