"It has become a regular occurrence over recent weeks that we seem to do enough to win and then let it slip.
"I am left wondering whether my players know how to win, we seem to believe the game is all over but find ourselves drawing a game," said the Palace boss.
When you score two goals and have fifteen minutes left you are entitled to win.
"As a Manager I can't legislate for individual mistakes, both Shaun Derry and Hayden Mullins were apologetic to their team-mates but players must learn that these errors are costing us maximum points."