"We have got a soft spot in us at the moment," said Dave Jones "The goals we gave away in the second half were poor and could have been stopped quite easily.
"The players aren't doing what is asked of them and that is the frustrating part. Certain players stopped performing and it has got to stop.
"The sloppiness is happening too often. The soft side runs through our whole team and maybe now's the time to change things, because some of my players need to check if they are really doing their jobs."
Jones also vented his frustration at the officials. And, while labelling Joe Ledley's sending off "harsh," it was the decision to rule out Michael Chopra's first-half strike for offside that really riled the Bluebirds boss following the 3-1 defeat.
"We keep talking about injury time and playing on too long, but the bigger issue is still getting the decisions right at vital times," he added. "Chops' goal was a goal because he wasn't offside - it's as simple as that.
"I've been done out there and that's the issue, because goals change games. We are getting frustrated by a lot of things like that at the moment."
Brian laws also thought Chopra's goal should have been allowed.
"I've got to say I thought they were very unfortunate not to get a goal as I thought Chopra's was actually onside if truth be known," said the Wednesday boss."