jerking jQuery momentum scroll

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jQuery

Scrollbar

scrolling

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I am using jquery.momentum.js for an application on which i am working.

I have noticed that the scroll bar used for displaying events on webpage is suddenly begin jerking up and down in small motions very quickly when I touch and move mouse pointer up side or down side.

I have tried to modify the configuration in js file but it seems it is not working , It is still begin jerking up and down in small motions very quickly when i touch and move mouse pointer up side or down side. Here are the parameters i tried to change.

 fps:               60,    // Frames per second in msecs.
direction:         null,  // "vertical", "horizontal", or null for both.

scrollDuration:    2000,  // Duration of the scrolling animation in msecs.
overshootDuration: 250,   // Duration of the overshoot animation in msecs.
snapbackDuration:  350,   // Duration of the snapback animation in msecs. origianl value =500

moveThreshold:     100,   // Time between mousemoves must not exceed this threshold.

useCSSTransform:   true,  // Use CSS "transform" property instead of "top" and "left" for positioning.

Any help guidance appreciated.