Sounds like you had the trans in tow/haul and were at that point between 2nd and 3rd. Happens to me when the speed is at a certain point and there is a slight incline in the road.
If you are in tow/haul try turning it off and see what happens. If you were not in tow/haul try turning it on to see if the shift points change.
Also, before anything, check your braking system to make sure it is adjusted correctly and that you do not inadvertently have the brakes applied on the toad. I've known a lot of folks who have complained about towing only to find they did not adjust the supplemental braking correctly or they forgot to completely release the parking brake.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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