Those symptoms usually point to a root problem. Likely causes include soggy soil conditions, damage from weed killers such as are in some weed and feed products. There is not cure for the weed killer injury but time. If soggy conditions caused that you might be able to save it by allowing it to dry out a bit and then just keep it moist not soggy. It depends on how bad the original damage was.
If the maple was planted in the past month or two it may just be suffering from transplant shock which is best fixed with good care and time.
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