Insects have been eating the foliage, but since it is all brown, it hasn’t been recent. Think back to when you first started seeing this, and next season start looking a couple of weeks before that. Once you have figured out what is causing it, you can figure out a strategy for it. For instance, if it is Japanese beetles, which is one insect that can cause this type of pattern, I spend a few minutes most days either early morning or in the evening when it is cooler with a container of soapy water that I hold under the beetles’ perch so I can knock them in to drown.

Thanks NHBabs, it's been like this for a while but it just occurred to me to ask. It probably is the Japanese beetles, I have seen them around the yard but not for at last a month or more now. I'll have to keep an eye out next year. I have never had issues with this shrub until this year and I have had it for 20 years. Thanks again!