I have a mature Redblood Jap. Maple
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I could find nothing on diseases as you mentioned. Here is a site with general advice on growing Japanese Bloodgood Maples. If your tree is suffering, a local arborist will be the best source of information.
http://homeguides.sfgate.com/caring-japanese-bloodgood-maple-100235.html
If you read the info on this site you can click on more specific details:
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-problems.htm
can you post a photo?It could be a few different issues
Powdery mildew
Canker
Leaf spot
Root rot
Once you can identify the disease attacking the Japanese maple, you can take the necessary actions to control and prevent it from returning.