Why does my Motorola Droid go back to the home screen during a phone call?

During phone calls, my motorola Droid will go back to the home screen. This is especially a problem when I have to use the number pad because I have to unlock my phone, press the phone button, then press the keypad button to get back to the keypad during a phone call. Had anyone elses Droid done this? Is there a solution?
 
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