ALLEN PARK, Mich. -- For the third time in four weeks, the Detroit Lions have had 10 men on the field during a special teams play.

And for the third time in four weeks, Lions coach Jim Caldwell took the blame for Detroit’s inability to have 11 men on the field to start at least one special teams play in Thursday night’s loss to the Green Bay Packers.

“That’s my job, to get that straightened out,” Caldwell said. “I have not done a very good job of that. We’ve had a couple different situations that have occurred. Communication wasn’t great, and that’s my job to get it straight.”

This started in Week 10 against Green Bay, when the Lions had 10 men on the field for two Packers field goal attempts, including Mason Crosby's missed 52-yard try on the final play of the game during Detroit’s 18-16 win.

The next week, the Lions had 10 men on the field for a Sam Martin punt against Oakland before Brandon Pettigrew ran on late. Detroit was then flagged for an illegal formation penalty on the play because Pettigrew was lined up wrong.

Then against the Packers on Thursday night, the Lions again had special teams issues on a Matt Prater field-goal attempt in the fourth quarter, forcing Detroit to burn a timeout when a player ran onto the field late.

Caldwell, as he has said multiple times after special teams personnel miscues, said the Lions are working on getting it fixed. But he admitted in that area, he hasn’t been performing well.

“Yeah, I’m not doing a very good job,” Caldwell said. “I got to get better. I’ve got to get better at my job.”