Fuschia problem

About 5% of my fuschia leaves are turning yellow amongst three different varieties, on large and small plants.Some at the plant base and others at the top.Both in pots and in the borders.They immediately drop off when touched.Flowering well but unsightly,any ideas please?

 

Not a fuchsia expert, but I think too much watering is the problem , also to much feed or to little I feed mine every two weeks

Whats your feeding and watering regime ?

Lets see what the others say .....

Spruce

 

It's possible the pots were a bit waterlogged in the spring...I've drilled more drainage holes now.The compost has slow release fertilizer in it.
Thank you for your post.