Ailing star jasmine - brown leaves
I've had a potted jasmine since last year which has grown beautifully and produced great flowers last summer. This year it has grown somewhat, but a lot of the leaves turned yellow. I've been feeding it with Tomorite (as per RHS advice) and the yellowing has stopped but now there are large brown patches on the leaves. I have been watering it regularly and evenly but don't understand why this is happening. It has a few flowers but not covered like last year.
I've fed it every 3-4 weeks for the past couple of months.
Any ideas? All advice welcome.