Sporadic and intermittent are similar terms that can be used as synonyms in this sentence.
Sporadic refers to recurring irregularly or at random, or occurring only rarely. It refers to the distribution of something over time or space that occurs in sporadic occurrences or isolated outbursts and is not regular enough to completely occupy space or time. It denotes uncommon occurrences that are dispersed.
Intermittent means neither continuous nor constant; it happens at sporadic intervals. When something is intermittent, it only occurs sporadically. It indicates irregular resumption and pauses; arrival after a certain interval; and a lack of steadiness or consistency.
