Oranges are splitting and next falling past its sell-by date the tree, what would do this? We have a Washington Orange tree and for some motivation the oranges...

We have a Washington Orange tree and for some motivation the oranges have started splitting and falling stale the tree, do you know what might be causing this to take place?
Answers:    Many reasons:
Not ample water.
Too much Water.
Too much fertilizing. (They grow faster than they're competent to and split.)
Coule be some sort of bugs messing up the tree's natural proclaim.
Frost