Occasionally; now and then; sometimes.
彼は間々遅刻するが、仕事は確実にこなす。
He is occasionally late, but he always gets his work done.
間々休憩を取りながら作業した方が捗る。
It's more productive to work while taking occasional breaks.
天気が間々崩れるので、洗濯物は乾きにくい。
The weather breaks up now and then, so the laundry doesn't dry easily.