Riverbank

6 speed someone told me it could be the sensor

I have a 2018 sierra 1500 5.3 the tranny was banging but mostly between V4 to V8. I towed a pop up camper for 3 hrs in haul mode. Dropped it off and went to get supply’s and my tranny failed on the way back . But what was odd I could turn it off and after it cooled down it would run fine til it got hot agian . Please help I’m on a river bank and need to get back to work.