Where are our foxes?

We used to feed a family of foxes for years. So much so that around 10 at night we could see the cubs waiting for din din sat on the pavement on the other side of the road. Since September last year we lost sight of them, did not hear them calling during breeding season and they are not coming for food any more. Anybody knows what could have happened? Is this usual behaviour? We have known foxes in this area ever since we moved in, about 16 years ago. And they have known us, usually coming in the garden to eat and really close to us if we kept still.