Originally Posted by pdragon

I don't think you completely disable in the included Messages program to fix the issue. The problem is sending a text with Messages causes a setting to be flipped that won't allow the phone to go into full standby mode. No one ever said you needed to completely disable it to fix anything. Using Taskiller was just something people trying to fix the problem were doing to narrow down what was causing it.

Install chompSMS.
Power Cycle your phone.
Never use Messages again.
Done