Bury assistant manager Chris Brass questioned his side's heart following the 1-0 defeat to Accrington.
The Shakers extended their winless run to four games as Joe Jacobson headed home a Sean McConville corner in the 77th minute.
It was a deserved winner for Stanley as they had been thwarted by Bury keeper Cameron Belford, who made fine saves from Terry Gornell, Jimmy Ryan (twice) and McConville, throughout.
Brass said: "The effort and commitment was not there and I don't know why. You have got to give Accrington credit as they are a good side.
"We lost 1-0 at Bradford but we lost to a cracking goal. We played well but this time, we were lucky to be 0-0 at half-time and we told the players and we started the second half well but then we fell away.
"We didn't have too many chances but you can't always pass the ball and play the beautiful game - sometimes you have to do the ugly things well and we didn't. We are a young team, we have good players here and we believe in them - we just have to hope this is out blip and we get out of it soon."