Currently holding off upgrade to 8.1.2P4 although it does fix a lot of issues but had several "out of frying pan into fire" upgrades. Just checked on the Netapp Download page (Jump to release at bottom of page) and it's showing already:
Data ONTAP - 8.1.2P4D1 642674 - SMB 2.x authentication requests (Kerberos) fail for certain security buffer sizes
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