How to prevent loss of steps in the stepper motor?

Hello, I'm having trouble finding things about the NI USB-6009 because most people use arduino, so I decided to ask them here.

I'm having problems with loss of steps, I'm using this code in MATLAB R2016a:

xDir=daq.createSession('ni');
xAddDir = addDigitalChannel(xDir,'Dev1', 'Port0/Line0','OutputOnly');
xStep=daq.createSession('ni');
xAddStep = addDigitalChannel(xStep,'Dev1', 'Port0/Line1','OutputOnly');

outputSingleScan(yDir, 1);
pause(0.01);
for motorstep = 1:800
    outputSingleScan(yStep, 1);
    pause(0.01);
    outputSingleScan(yStep, 0);
    pause(0.01);
end

The motor is set to 1600 steps = 1 millimeter

And I realize that little by little it does not return to the correct position.

I researched and said that working with micro steps is better because it works with more precision.

If someone can help me by telling me that I can improve on the code, or if the problem is in the engine, or if you can recommend me some better place to practice this micro step (I have no idea how you use it, I am very layman in it ), I'll be very grateful!

[pedro luis pereira morais]

I was able to solve this problem by doing the following: I changed the settings to 800 steps = 1mm and removed the clearances between steps, now everything is fine.