Have you had some cold nights recently? They are hardy but the new growth can be affected. I'm assuming that's a variegated one and the colour is normal?
It's possibly wind damage then. They do prefer some shade, so it's probably suffering from it's location a bit, especially if you have a few colder nights, and some windy weather. they get frazzled a bit, whereas the plain green ones tend to be ok.
It's a place where beautiful isn't enough of a word....
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They cope with quite severe, sustained cold weather, but variegated plants are always weaker.
They do prefer some shade, so it's probably suffering from it's location a bit, especially if you have a few colder nights, and some windy weather. they get frazzled a bit, whereas the plain green ones tend to be ok.