If you turn off cellular data transmission via the radio menu system, the problem goes away (at least on my 2020 SL Plus). Of course, this means that you can’t use the Nissan EV Connect app until you turn it back on.
Another one reporting here, I got the dreaded P31E7 / P0AA6 errors immediately after a 30 minute fast charge at a Nissan dealer. My Leaf is a 2020 SL Plus (18 months old, 16000 miles). Just got it back from the dealer a week ago, they had it for 67 days (battery module was back ordered). The...