How do you know if the file daemon or storage daemon hangs?
Are there some jobs which run parallel on one window client?

Can you see any progress when sd hangs with

stat client=<client>-fd

What is the config of your file-daemon / storage-daemon?

when connection is refused on querying sd, perhaps you shorten maxim 
concurrent jobs on storage-daemon.
Each request on daemon counts as a job.

Regards,
Gunnar

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