Those symptoms may be due to several possible causes. Some herbicides can cause bleaching of new growth, soggy wet soil conditions can cause loss of roots and the leaves may then lose color and drop, or sunburn can also bleach out and kill foliage. Whenever shoots die on that shrub the foliage may bleach out as it dries out and dies. Thus I might look to a root problem or possibly a stem blight or some type if there is a distinct line between green and bleached foliage.
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