Those are certainly Viburnum opulus 'Roseum', the sterile snowball flowered form of non-native European Cranberrybush Viburnum.
In my experience in Kentucky, a borer attacks stems of this species (along with the related native Viburnum trilobum), which generates the annual dead branches. There really is no good answer for that except to replace them with something that doesn't have this problem.
If you asked me, I'd suggest a really easy grower, the native Viburnum dentatum. Arrowwood Viburnum grows with abandon, will get every bit as big as what you currently have, but will have late spring white fertile flowers which when adequately cross-pollinated will produce dark blue fruits which birds relish. That means you should plant two different named selections of Arrowwood Viburnum, like an 'Autumn Jazz' and a 'Chicago Lustre'.
Following that plan, you will have attractive flowers, copious attractive fruit, bird food (which will drop the seeds to produce more plants), and reasonable fall color across the yellow/orange/red/purple spectrum. Not too shabby.