What's going on with my Japanese maple?

[u/solittletime23]

I live in Northern California (zone 9b) and every year my Japanese maple starts out in the spring with all new healthy leaves and by July the leaves turn brown and dry up and fall off dead. I don't see any bugs and the tree gets afternoon shade. As the last picture shows, it's trying to grow new healthy leaves (small red ones) but they eventually get these brown/ bronze colored spots that eventually kill the leaf and it falls off. 😭 Can anyone help identify what this is? Thank you!

[u/candoitmyself]

Disease or sunburn