Something which is intermittent is not continuous and occurs at intervals of time. Something which is intermittent begins, stops and begins again.

1. It was a generally sunny day with intermittent patches of rain.
2. Intermittent fasting is quickly becoming a big weight loss trend.

1. The negotiations went on intermittently for months before an agreement was signed.
2. Ever since the new software was installed, we have been experiencing intermittent problems with our computer system which have proved very difficult to identify and resolve.