One of my customer, Mando is developing Radar system with TPS54240-Q1.
During the chamber test, they found the output voltage change at temperature, -40C.
Have you seen those case such as Vout variation at -40C?
Vout=3.5 at room temp
Vout=3.15V -> Vout=3.6V (few secs later after turn-on at -40C)
sorry for the lack of information, i will update you very soon with details. just want to check if there is similar case.