Interfacing Arduino with Pololu JRK21v3 help please!

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}

void loop()
{
if (mySerial.available())
Serial.write(mySerial.read());

mySerial.println("11, 700");

}

This is what I have right now my jrk 21v3 moves and but doesn't move correctly I have mine set to at 9600 though. Have used the code off of pololus websight and it only makes jrk kind of freeks out it it moves a little then it stops then it moves and then stops every time a new loops starts. I have tested this by adding a delay from 500 to 1000 to 5000 and the start and stops with this delap. Why the pololu doesn't keeop moving is what I'm trying to figure out right now.