We have 100 feet of laurel hedges we believe are English Laurels. Sections of the hedge periodically die and we're not sure why. The leaves turn brown first then the limbs. We've used copper spray for fungus and deep pruning down to the stump which gets the plant to get new growth for a while, but it doesn't last. This repeats yearly in one spot and we are clueless. Unfortunately, I didn't get a picture of it before we doctored it recently. Any suggestions on what might be doing this? The rest of the hedge is very healthy and gets regular pruning.