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If you can include photos, then I can make a better diagnosis, but it sounds like a fungal infection. Unless it is hot, or very dry, it may not be necessary to water that often.

As a general rule, one should water when the soil is completely dry down to about 2 inches. Sometimes it is good to let it dry out just a little more than this as well.

I recommend treating the area with wettable sulfur, and just a small closed handful of dolomitic lime around the base of the shrub out to about 1 foot around the tree on each side. This will be a light, even broadcast.

These will help fight the infection, as well as recondition the soil back to a more suitable condition.

This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azaleas-noteworthy-shrubs-for-any-garden.htm