Jean is it possible for you to post a picture of the shrubs?
In my observation, azaleas vary all over the map on their ability to stay green all winter. Many are "semi-deciduous" and drop many yellow interior leaves in December. If yours look like the ones posted, you have nothing to worry about. The green leaves at the tip give me confidence.
Thanks for your help!
One of the explanations Anne has heard is that because there are later season blooms on the Encore's and Gumpos the leaves are lost later in the season so we don't see the yellow leaves until late season. If there are signs of leaf buds and green leaves near the recent blooms they are "normal."
Jean, I may be considered a heretic for this, but I only like most azaleas for about 3 weeks out of the year. I prefer the Indica family because I think they are a somewhat handsome plant year round. The yellowing of leaves is normal and expected in all the varieties-white blooming (based on purely observation/not science) tend to drop more leaves.
Although they are deciduous many of the native azaleas are worth considering for your garden and some are fragrant too.,
there are types that bloom early spring and some as late as August
like Rhododendron prunifolium- famous for its show at Callaway Gardens