Have they been very wet?
Best case scenario some root rot from too much water which is recoverable.
Prune out all discoloured foliage, allow to dry reasonably between watering and fertilize regularly
Worst case scenario a systemic vascular disease such as verticillium wilt.
Cut off a diseased branch and look for a brown ring inside.
If there is one the plant is not salvageable and will rapidly succumb. Pull it and bag it immediately Along with any others showing symptoms.
I hope it is just over wet.
KarenO
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