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My '17 5.0 has done this from new in moderately cold conditions (-20c). The first time was when the truck was only 7 months old. I had to explain to the dealership what Deep Sleep mode was, as they had never heard of it. They tested the battery, and it was still in spec according to them, but...

I'm not sure if it has changed, but when I inquired about it on my '17, in 2018, I was advised that it was set to go into Sleep Mode after 14 days of inactivity. Mine actually went into Sleep Mode after only 36-48 hours in 2018. It was -30 C for a few days, and it must of drained the battery...