The Baffin, as well as a number of other roses in the same vicinity, have contracted some disease that is causing the leaves to turn brown and dry up. In the worst case, the rose appears dead with the flowers drying up also.
William Baffin Rose Has Contracted Disease
This sounds more like something either got poured onto the soils around the roses, some herbicide spray got onto the foliage or neighborhood dogs are relieving themselves on or near the rosebushes. As long as you are keeping them well watered and fed, they should not react this way. There is more going on here than immediately meets the eye I would say. Take some soils from the ground right by the affected rosebushes and some cuttings. Place them in a plastic bag and take them to your local extension or agricultural office and see if they can do some tests. It could also be that some grubs are eating away at the root system and thus destroying the means by which the rosebushes take up food and water. In such a case, I would treat the entire area with a product called Bayer Tree & Shrub Granules. This product will get rid of the grubs and protect the upper part of the rosebushes as well. plus give them some nourishment. I would make an application of the Bayer product ASAP truthfully.