Printer keeps stopping halfway though run of

Ensure that your ribbon is not popping off. Push ribbon onto sprockets This problem is usually caused by the ribbon protruding into the holes in the cardboard core. Use a sharp knife and cut away excess ribbon. You could verify this by removing the ribbon & re-printng a batch of labels (change driver settings to direct thermal mode)

Usually this is a sensor problem. The printer is not recognizing that the labels are moving through. Remove the labels and blow out the interior with clean air. That may resolve the problem. Dust can accumulate on the sensors and cause this.

Please update this if that does not resolve the problem.

Thanks,
Dan