HTC guy states Sprint and HTC are working day and night to try and fix this issue and here is what it is. Its an incompatibility between the EVO and Sprint towers equipped with Motorola made transmitters. It seems that the phone and the Motorola towers have an incompatibility issue causing the EVO to keep searching for the tower even though its connected using gobs of power doing so. He also said they are not sure if it can be fixed with an over the air patch or not that it may end up being a hardware issue but Sprint is trying to modify the towers to compensate for the issue.