You don't say how long you've had the plant, nor how long its been in the same pot and what size the pot is - it should be a minimum ten inches deep by 12 inches wide, and you should be watering copiously and feeding weekly if it has fruits present. The plant should have been hard pruned during the dormant season in winter - from this list of things, are there any you haven't done/been doing?

Thank you for your help the plant is about 18months old and has been in the same pot since it was bought for me but I will repot in a larger size and keep all your tips in mind thanks again.