Skipped stitches could result from several different origins. First, easiest, and least expensive thing, try a brand new needle. However, if it is failing to pick up the bobbin thread all together, then it is probably out of time (search for sewing machine timing or take it for service).
Here are other suggestions for intermittent skipping:
What to Do If Your Sewing Machine Is Skipping Stitches
10 reasons for skipped stitches
Basic Maintenance Tension Skipped Stitches
http://www.sewingreviews.org/what-to-do-when-your-machine-starts-skipping-stitches
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