2010 cammed 6.2l with A6. Truck driven to track on tune with no issues. Only modified WOT shift points (mph/rpm), no changes to any other TCM elements. Dialed in the wot shift points and doing great. Leaves for trip home and it's flashing/ slipping on 1-2 shift point (part throttle) on initial restart. After that it shifts fine. What's going on and does it need a relearn or something?

Thanks!
Steve