Hi Rohol and welcome to GoY. Any chance of your adding a photo to your question? Will make it easier for us if we can see the problem.

How far north do you live? Possibly might just be the beginnings of autumn? Ours isn't dropping yet but it is still like summer here during the day.

I live in the North of Scotland and Autumn has begun. So maybe just let it do its autumn thing and await the ne w growth.Never had one before so wasn't sure. Do you prune yours at all?.
Thanks

Pruning is different depending on what you want. if you want a smallish bushy plant just grown for the leaves you can prune it quite hard now. If you want flowers wait until they are over and prune then.

Thank You. Great help