Edge 840 only gives rest days as DSW

I have used my Edge 840 for about 9 months and I have it paired with HRM Pro+, plus Favero power pedals. I have registered about 2700km of riding during this time. But I only get rest days as suggestions with DSW feature. Why does it only give me rest days and not some workouts to do?

I also have a Forerunner 165 and it gives workouts every day with the DSW feature, it gives seldom rest days.