It sounds like you need to change your Motion Mode. Go to Config>General Config dialog box and check the Motion Mode is set to Constant Velocity, not Exact Stop. On the right there will be CV control. You probably should uncheck any of these. There is also a box somewhere in the middle that says Look Ahead. If your computer is reasonably fast, you should type 190 or so in the box instead of 20 that is the default. Maybe that will solve your problem.