Q.Holly losing leaves
My one holly is quickly losing its leaves this spring, similar problem last year. The leaves are turning brown and falling off. The plant is over 40 years old, and I didn’t have a problem with it until last spring. Never had it pruned; could that help?
It does sound like scorch.
I have listed a couple links with great information about how to protect your plant for next year.
Also a link about proper pruning for holly.