it started happening faster in hotter conditions, 24-27C, but still happens at around 20C.
When I narrowed it down to the card being the issue, I would just leave the camera running on my table while doing post work, and would regularly fill up the card or run out of battery with the Delkin or OWC without any warning, but with the Lexar card about 10-12 minutes in, the heat warning sign would come on, and it would terminate recording in about 20 min or so.
PS Should add the cards that cuz thermal issues for me are 128GB gold Lexar Cards