Sentence:  Eventually such incidents became more <WSD>sporadic</WSD> , and more sharply demarcated from her day-after-day behavior , and in one particular session , after several minutes of such behavior - which , as usual , went on without any accompanying words from her - she asked , eagerly , `` Did you see Granny '' ? 
Meaning of the word marked with <WSD> tags:  recurring in scattered and irregular or unpredictable instances