Could you please give more detail? The title doesn't include any details about your issue what-so-ever, so people wouldn't be very inclined to help you.
Your problem is that the object in question is stopping when you don't want it to? The code you have provided works for me, and I continue to move. Is there code you're not providing that may be causing the issue? Or perhaps you have a collision object in the way that you just forgot about?