I just got my first android phone. My HTC EVO. I love it. But recently its been running extremely slow. It takes about 2 seconds for an icon to even highlight when i tap it. then another 2 second to open the app. Now, I'm new to Android, and I got an app killer, and I leave 4g and wifi off.. my friend suggested I take out the battery to reset the system. And now its working fine, but I'm dreading the next time it gets slow. What is going on with my phone?