Is anyone familiar with a app or process that could be used to keep Sprint 4G alive on the EVO? I find Sprint drops my 4G down to 3G periodically each day--the 4G icon switches to 3G. It may be happening because of non-use? Is it normal? The phone remains in the same location so I don't believe it's a radio issue. I need something that won't use up to much battery. I'm keen to resolve the issue because right now I have to hit the 4G icon twice whenever I want to use it. Once to switch it off and then again to reconnect, and the delay feels a bit like the good old dial-up days.