If the problem is consistent with certain types of fabric, it is usually the needle choice. Make sure the needle size and type is compatible with the fabric and thread you are using. There are several different types of needles (leather, ball-point for knits, sharps for wovens, etc)
Schmetz all about needles Google Search
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwi-l6mp4OLQAhVDgrwKHdRDAAsQFggtMAU&url=http%3A%2F%2Fwww.schmetzneedles.com%2Flearning%2Fpdf%2Fschmetz-needle-chart.pdf&usg=AFQjCNHTR52AmqwzvyCjbXmD5Ch52Va5_Q
https://www.craftsy.com/blog/2014/01/sewing-machine-skipping-stitches/
http://fashion-incubator.com/10_reasons_for_skipped_stitches/
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