The same problems plague the New Zealand women's hockey team, losing the third test 4-3 to Korea.
They have been swept 3-0 in the series.
Leading 3-1 with four minutes to play, the Black Sticks capitulated to a fourth straight defeat.
Sam Harrison opened the scoring for New Zealand with a goal in the 25th minute before Korea responded minutes later to even things up at the break.
Stacey Michelsen knocked in a penalty corner rebound just after halftime and Charlotte Harrison extended the lead to 3-1 as she slotted in an excellent cross from Krystal Forgesson.
Field goals in the 66th and 68th minutes and a penalty corner with one minute to go gave the Koreans the victory.
Coach Mark Hager says the side just switched off.