SOS wisteria

One of my wisterias--Japanese, 30 years old--started to shed it's leaves at accelerating speed last week, and now definitely looks moribund.  I can't understand it.  We've had no extreme heat this summer, and it bloomed normally last spring. It can't be old age because several other ones growing near it are nearly twice as old.  Does anyone have any ideas about what it might be or whether anything can be done?
 
Cali Doxiadis
Corfu, Greece
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