Azalee, brown leafs

Hey guys,

A good bonsai Brother, of me, has a azalee with some problems!

In spring and fall, the top of the leafs turn brown.(Photo) He has this problem, since 2 years ago. Even distribution,

In the summertime, no issues.

Is this a Kind of fungal issue, or a root Problem?
Its possible that he watering top much?

If it is too much watering, how shout i Tell him? This guy has been making Bonsai, for 30 years,:thinking:

Thanks for your nolage und help!
Stay healthy,

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