Sun Dec 17 2017 09:53:54 UTC
A "stable build" is a bug waiting to happen.
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ID Product Comp Assignee Status Resolution Summary Changed
32140 iOS BCL Clas bugzilla RESO DUPL The object was used after being disposed when canceling a task that is making a network call 2015-07-21
One bug found.

as

File a new bug in the "BCL Class Libraries" component of the "iOS" product