We've been working with TAC recently on a catastrophic fault we experienced on multiple catalyst 9300 switch stacks:
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn30950
Essentially your stack will split without warning creating two separate switches with odd forwarding behavior.... In our case layer 2 loops.
This issue affects 16.10.1, 16.9.2, 16.9.1, and 16.6.5 release (and 16.6.1 - 16.6.4).
Posting here in the hopes of preventing some potentially career threatening issues for others as version 16.6.5 in particular is an MD release
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