Drying leaves are not a good sign, if they were just turning yellow and falloing off, I wouldn't worry, but staying green and drying out is not a good sign. Your roots may be dead.
Not much you can do but keep it moist and wait a couple months. If no growth by end of June - its definitely dead.
Definitely - dehydration during winter is possible. Any repotting or other activity could have killed enough roots. Drying out kills new root tips, death can set in as soon as humidity drops.
I have a love-hate with Satsuki azaleas. About 10 years ago I started with 12 different whips. Today, I have 3 left. I think I can assign a cause of death to each of them, I pretty much treated them the same, grew them in the same spots, but for some I repotted t0o late in season, or too soon,. One was lost to drying out in winter. One was hard pruned at the wrong time of year, didn't harden off before autumn frosts. And the list goes on. The survivors are starting to look pretty cool. But they can, and do suddenly turn up their toes if you don't handle them right. They are "easy", but not particularly forgiving.
Potting media and the water you use is important, and will determine how well they survive the mechanical things we do to them. Death rate slowed considerably when I settled on a blend of perlite, kanuma, and a little pine bark. And topped with a thin layer of sphagnum moss. I also make a point of watering them with collected rain water as often as possible. Our tap water is medium in terms of total alkalinity, which is not ideal, but will work when nothing else is available. If you have soft, low alkalinity water at all times, you can grow azaleas in just about any mix as long as it is not crushed limestone. BUT, if you have water with a lot of dissolved calcium (medium or high total alkalinity) then you must use an acidic potting mix and try to use rain water as often as possible. Many potting mixes will work, but you have to eventually find the mix that works with your water quality and watering habits. There is no "one size fits all". Key for me was using rain water as often as possible. I would say about 75% of the year they get rain water. Usually they get tap water no more than once or twice a week, Rain water in between. (actually any low alkalinity water will do, distilled, RO, deionized, or rain water) With distilled and RO water, you need to add back a little fertilizer, or you can leach out the plants and get chlorosis.
That is why the nursery trade grows azaleas in peat moss. You can use high alkalinity water with peat moss, and the plants will live long enough to be saleable at the nurseries. Not a long term acceptable mix, because when the peat moss has all its calcium bonding sites exhausted, it will become as alkaline as the tap water being used. But it will work long enough to get plants saleable. Then it will be up to the new owner to plant them in a better media.