This normally happens to young players, when they lose the 2nd game after being in position to win a match, most times their belief is broken. Take eg. LCW vs LD in their 1st match, LCW won 1st game 15-3, only to lose 13-15 in 2nd. And subsequently lost the match. Even the great Susi Susanti had similar "hiccups" when she started out, most interesting was when she was a set and 10-5 up in the 2nd game, against the equally legendary Han Aiping. I saw that match live in stadium.