A weather change could be one reason. Be patient.
If it is a young tree with a huge amount of fruit I'd remove some of the fruit. they can't grow when bunched together. We use the following rule of thumb-no pun ended. Mak a fist and place it against one side of the fruit. If there is other fruit with in a hand's width, remove it to give what you leave on the branch room to grow. A younger tree will only support just so many pieces of fruit.