I think this discussion will get better responses on mailing lists 'sr-users [at] lists.sip-router.org', because it is more about configuration rather than development. sr-users is the place where you can find more Redis users that can help from past experiences.
On the other hand, ndb_redis should reconnect, maybe the microsoft public server has some policies on traffic and number of connections. Have you tested for sake of double-checking with a local redis server?
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