I just received the following email:

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Hello all,

I have had similar problems in the past and they were solved by not
only carefully releasing the objects and setting them to null as you
do here, but also creating a separate worker thread that is the owner
of the MODI objects. This thread declares, instantiates, and destroys
the MODI objects.

When it exits, all should be released.

Hope that helps someone!!

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I have not tested it yet, but this may solve the issue.