I ordered this Lug(was $3.59 a month ago.) Haven't installed it yet as I've had no issues since putting a clamp on the existing fitting.
Most likely it's the loose cable connection issue. Some have been able to get it in to the dealer to be fixed, others have waited 2 months with no truck while the dealer tries to fix the issue.
Your call.
https://www.mavericktruckclub.com/forum/threads/hybrid-battery-cable-clamp.17052/
You can try this to see if it is the cable connection. I have had zero issues since doing this.
I did order this to replace it in the future, if necessary, https://www.amazon.com/dp/B005GDG7DU?psc=1&ref=ppx_yo2ov_dt_b_product_details
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https://www.mavericktruckclub.com/forum/threads/hybrid-battery-cable-clamp.17052/