Japanese Maple with heat/sun damage?

Japanese Maple with heat/sun damage?
Originally uploaded by dewelch.

This photo shows what happens every year about this time. Although the tree is in a shaded area the high heat seems to cause the leaves to curl and turn brown. There is no obvious sign of disease and it seems to happen every year when we get our few weeks of 100+ temperatures.

I have read else where that Japanese Maples are susceptible to sunburn so I guess I will just have to chalk it up to that cause. It doesn't seem to cause and major damage, but it can look a bit unsightly. Moving the tree is probably out of the question as it is moderately large and I am not sure where else in the garden it might go.
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