Well, for as long as I remember, Juve have a hard time dealing with the label "heavy favorites" Every time the media and everybody thinks that Juve is unstoppable and will get an easy win, bad things happen.
And on the contrary, many times where Juve was the underdog, they end up preveiling.
This time though, I think we were just tired, too cold. But I thought we'd get the win too, but I underestimated Bayern's defense.