Last year they all fell off. It might have been because it was only two years old. Some of the leaves are turning yellow. We have been watering it every second day. Water can be one of the hardest issues to address when dealing with plants, because the symptoms for too much water are the same as the symptoms for not enough water.
All fruit plants require well-drained soil in order to grow and produce properly.
So if you water too often you force the oxygen out of the soil and the plants cannot use the water you are applying. Plant roots require oxygen in order to take up the water. So I think if you are applying water every two days, you are applying it too often. Every 7 to 10 days is probably adequate right now. The best way to determine if you need to water is by feeling the soil.