I have a 2016 F36 420D with the ZF8HP45 doesn’t go in reverse or manual and till I get to 40-50 mph the car is dead bearly pulls but after that pulls great when car gets hot will go in reverse but as soon you try to go it goes in N 1 time it did do in Manual and drove fine when was hot but I tried after but it didn’t do it again what could it be?