Customer Ratings?

Was stuck on 4.84 for a long time. Went down to 4.81 yesterday and the. 4.80 today and not five minutes later back to 4.84. My in time or early percentage went up to 96% from 95% at the same time my customer ratings had dropped to 4.80 and went back to 4.84 since. Does anyone have any clue what could’ve happened?