"Erratic nature" refers to something or someone that is unpredictable, inconsistent, or irregular in behavior or actions. It means that they often act in unexpected or random ways. Full definition
It is this very erratic nature of displays that will have the Chelsea fans worried against a star - studded Liverpool attack. (thehardtackle.com)
And while Stone initially proves adept at blending the two time periods, there inevitably reaches a point at which the lack of a linear structure becomes oppressive - with the ensuingly erratic nature of the proceedings effectively preventing the viewer from connecting wholeheartedly with the material. (reelfilm.com)
While Michelle Williams predictably delivers a solid performance, it's difficult at times to understand or empathize with her predicament and decisions, due to their impulsive and somewhat erratic nature. (awardscircuit.com)