Sage reported a trading update today. It's the first one that I recall them missing expectations/forecasts.
They also revised their full-year guidance.
As with most company stock results, the issue is not so much having a bad quarter as being unable to predict/forecast for it.
https://www.bloomberg.com/news/articles/2018-04-13/sage-group-announces-surprise-growth-warning-cuts-2018-guidance