My I phone 4 keeps going to voice call.  Voice call is turned off in my settings... how do i stop this?

My I phone 4 keeps going to voice call.   This happens when I push the home button.  It also happens when the phone is just laying on my desk or in my pocket.  I have turned phone off and on.  I have done a hard restart also.  The home buttom seems slow to respond as well.  I keep getting calls back from people in my contacts list who say I called them, when actually the voice control/call did it while i was away from my phone.   Frustrated and needing help!  Thanks!

Follow the directions here:
http://support.apple.com/kb/ht3577

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