LAKE FOREST, Ill. – Brian Urlacher isn’t quite sure how to explain the Bears’ second-half breakdowns this season. But the All-Pro middle linebacker knows that they must stop.

In their three losses this season, the Bears have permitted six points in the first half and 79 points in the second half, including 65 in back-to-back defeats to the Dallas Cowboys and Detroit Lions.

Brian Urlacher and the Bears have yielded just six first-half points in their three losses this season.

“I wish we knew what it was so we could fix it,” Urlacher said. “But it’s just nothing the coaches can do. It’s on us players. We’ve got to make plays when we get a chance to do it. That’s what it all comes down to. We’re not tired; we’re not out of shape. People want to speculate on what it is and what it isn’t. We’ve just got to make plays.”

Last Sunday in Detroit, the Bears gave up touchdown drives of 70, 80 and 62 yards after permitting just 97 total yards in the first half. It was a similar story a week earlier when Dallas snapped a 10-10 tie with 24 unanswered points, scoring on TD drives of 89, 91 and 78 yards.

“We haven’t been getting it done,” said linebacker Hunter Hillenmeyer. “Even last week, that was our emphasis all week in practice, making sure we finished and making sure we played a good second half. [But] we just didn’t do it.”

The Bears are trying to replicate their Week 2 performance against the Chiefs when they generated two turnovers and three sacks on Kansas City’s final three possessions in preserving a 20-10 win.

“We just need to strive to do that,” said defensive coordinator Bob Babich. “We’re trying to figure out what we need to do. The only thing we know to do is go back to the basics and make sure our fundamentals and mental framework is where it needs to be and just go from there.”

Block party: Israel Idonije has blocked a kick in three straight games, deflecting field goal attempts of 48 yards against the Chiefs and 23 yards versus the Cowboys and an extra point try against the Lions.

“Blocking a kick is a collective effort,” Idonije said. “I’ve got Darwin [Walker] and Anthony Adams on my right and left pressing the pocket, and [Urlacher and Hillenmeyer] behind giving me that push, and helping you get that extra momentum is everything. We’ve been working well together.”

Idonije isn’t the only one blocking field goals. Alex Brown deflected a 33-yard attempt against the Chargers in the season opener and Danieal Manning blocked a 39-yard try versus the Lions, enabling the Bears to become the first NFL team to block a field goal in four straight games since the 1982 Packers.

“The ball has to come out at a certain angle, so I think the main key is just to penetrate the line of scrimmage and get to the second level,” Idonije said.

Debut performance: Rookie running back Garrett Wolfe carried the ball for the first time as a pro last Sunday, gaining three yards on three rushes against the Lions.

“It was exciting,” Wolfe said. “It’s still football at the end of the day. But it was great to be able to say I played in that game.”

The third-round pick from Northern Illinois had played only one snap in the first three games this season, making a tackle on a Rex Grossman interception after being the intended receiver on an errant screen pass.

Wolfe hopes to see even more time Sunday night against the Packers.

“I don’t expect anything,” he said. “I know I’m a situational guy and know the situations are different week to week. If a situation arises for me to be able to get in there and play, I’m all for it.”

Special effort: It’ll never happen, of course, but it would be entertaining to watch how electrifying return specialist Devin Hester would fare against a Bears kickoff coverage team that leads the NFL with seven tackles inside the 20 this season.

“We’re just trying to help the team win the best way we can,” said special teams standout Rod Wilson. “That’s covering hard and returning punts and kicks.”

Wilson leads the Bears with seven special-teams tackles, one more than Pro Bowler Brendon Ayanbadejo.

“We all try to compete against each other,” Wilson said. “But at the end of the day, we’re all just one.”