The Monday night before the cup final started it.
The club allowed the players to get pissed, (until 4am) and that gave them permission to lose the final. It was now acceptable, who could better the treble and then 4 in a row ? The final was just the first 'it's ok to lose match
I know why it was done, it took huge mental strength to win 4 in a row but professional athletes should not have gone on the piss until after the final. . They switched off and have not got the mental strength to switch back on again as the more we lose the less painful and more acceptable it is.