I have this small shrub which was so healthy in the spring as well as all the years I have had it. Then all of a sudden about a month ago we found the leaves turned brown as though it died, It happened quite rapidly. But there are still some leaves poking through that seem unaffected. It looks really weird like the leaves have been eaten from the inside, and whoever did it left all the edges of the leaves intact. Almost like eating the inside of a slice of bread and leaving behind the crust. :) Does anyone have any idea what may have caused this? Could it be an insect or maybe a disease?