At irregular intervals (14)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at irregular intervals</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for intermittently that I've seen before include "Not all the time" , "(Happening) with pauses now and then" , "sometimes" , "So as to occur at irregular intervals" .)
(Other definitions for sporadic that I've seen before include "Occasional - intermittent" , "Happening irregularly" , "Scattered - irregular" , "Picadors being scattered, here and there" , "infrequent" .)