The flower heads on my shrubs are not opening, giving them the appearance of claws. I cannot see any obvious sign of insect infestation.
Certified GKH Gardening Expert
It sounds as though the plant is lacking phosphorus. This would cause the plant to stop blooming. Add some phosphorus to the soil. This article will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm
This artilce will help determine if there is a problem with your azalea: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm