While pootling about making up some easy problem the other day, a largish section came off the bottom (apparently it didn't appreciate being stood on by a fatty although I'm blaming the late freeze). It was a flake about one foot high and a good few inches across. The bad news is it removed a half-decent foothold. The good news is that the new foothold, while worse, is the only non-polished foothold on the crag.
I left the flake there respectfully lest it's integral for something, but someone subsequently chucked it a couple metres back by the tree.