Sanchez always did give the ball away and often cheaply, this isn't anything new. He just doesn't have the juice/dynamism in his legs to hustle anymore. His mind says I want to do this, his legs aren't responding as quickly as they use to. Also he probably realised his mistake of
Money > Medals, Jose > Pep.
Him losing legs is the main thing, because it is the thing he is known for, the high intensity of his running to get the ball back. He has been playing professional football since he's 16, nearly clocked up 700 games, played summer 14, 15, 16 and 17 and with his style that will take its toll and catch up with you eventually and he isn't even 30.
He looks exactly how Torres looked in his last days at Liverpool and at Chelsea.
I cannot remember which one of the brehs
@Montez @mastermind @frush11 said it while he still at Arsenal, but they said last season Sanchez looked done.