Trees, Shrubs and Conifers: Can you identify the problem with these (possible) viburnums, 3 by DonnaMack

DonnaMack wrote:
I have a client with viburnums that are showing stress in the form of burned looking leaves. They had previously been healthy. They are not certain what the cultivar is - I suspect some kind of trilobum. They finally got a few flowers this year because their landscapers had been pruning them every spring, therefore eliminating all flowers and fruit. For a time I persuaded them not to prune for size but they did it anyway. And now, I am seeing this, as shown in the picture.

I can see that new buds are forming, and again, they cut them back every year, but I do not recognize this condition. Can anyone identify it?

Thanks for any suggestions.

And, by the way, I have several viburnums, including trilobums, and they are fine.