Gariom, post some pictures of the tree and the leaves close ups if you can, that way you'll get much better advice as to what may be causing the problem...there are just way too many possibilities for the symptoms you describe...if pics are a no go then carefully describe what you see in the leaves before during and after they fall, pattern of discolouration, edges first? blotches throughout each leaf? holes? black or grey or yellow discolouration? The more info you give us the better we are able to help.
__________________ Sean  Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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