CHICAGO – After annihilating their first four home opponents this season by turning takeaways into touchdowns, the Bears discovered how the other half lives Sunday at Soldier Field.

The Miami Dolphins converted six Chicago turnovers into 28 points in knocking the Bears from the ranks of the unbeaten with a lopsided 31-13 victory before 57,531 stunned fans.

Rex Grossman was pressured throughout Sunday's 31-13 loss to the Miami Dolphins.

Rex Grossman threw three interceptions, one of which defensive end Jason Taylor returned 20 yards for a touchdown, and lost a fumble on a sack as the Bears had their 10-game home winning streak snapped.

“This isn’t exactly the way we planned today’s outing,” said coach Lovie Smith. “I have to give Miami a lot of credit. They played a lot better than we did today. Any time you have that many turnovers, it’s hard to win the football game. It’s tough to overcome that.”

Despite their first loss of the season, the Bears (7-1) maintained a three-game lead atop the NFC North over the Minnesota Vikings (4-4), who lost 9-3 to the 49ers in San Francisco.

The Dolphins (2-6) took control Sunday by scoring two touchdowns off turnovers in a :15 span early in the second quarter.

Rookie Devin Hester muffed a punt at his own 6-yard line after calling a fair catch, and Miami’s Eddie Jackson recovered the loose ball. Three plays later, Joey Harrington’s 5-yard TD pass to former Bears receiver Marty Booker gave the Dolphins a 7-3 lead with 10:47 left in the first half.

Booker tossed the ball to a young fan in the first row and blew kisses to the Soldier Field crowd as he jogged off the field. It was only the second time that the Bears have trailed at home this season and the first time since Oct. 31 when Seattle took a 3-0 lead before Chicago rallied for a 37-6 victory.

On the Bears' next snap, Grossman faked a handoff to Cedric Benson to the left, rolled to his right and threw the ball directly to Taylor, who gave the Dolphins a 14-3 lead.

“Obviously he’s a defensive end and (I) just kind of dropped and I didn’t really see him and (wasn’t) expecting him to be there,” Grossman said. “It seems simple that he’s right there, don’t throw him the ball. But I’m looking downfield and he’s such a big guy who jumped up and got it. It was a great play by him.

“Jason Taylor is a beast. He’s a great, great player, and he made a lot of plays. Hopefully we can just learn from that and improve and get better.”

Taylor sacked Grossman on the Bears’ next possession, forcing a fumble that was recovered by defensive end Kevin Carter at the Chicago 34. But Alex Brown intercepted Harrington’s pass intended for tight end Randy McMichael on third-and-goal from the 5.

Grossman, the NFC Offensive Player of the Month for September, entered Sunday’s game having thrown 11 TD passes and no interceptions in four contests at home this season in leading the Bears to wins by margins of 27, 31, 33 and 31 points.

“We didn’t take advantage of some opportunities and didn’t play real well,” said Grossman, who completed just 18 of 42 passes for 210 yards and a 36.8 passer rating. “The Dolphins played extremely well. It was a combination of them playing really well and us playing not up to our capability. In this league, everyone is good, so if you make mistakes like that, bad things are going to happen.”

The Bears entered Sunday’s game with a takeaway-giveaway ratio of 15-2 in their four home contests before matching a season high set Oct. 16 in Arizona with six turnovers. Chicago rallied to win that game in dramatic fashion with two touchdowns on defense and one on special teams.

“It’s hard to win when you have that many turnovers,” said receiver Muhsin Muhammad. “We’ll go back to work and we’ll correct those things and try not to make those mistakes and give ourselves a fighting chance to win games. You can’t do that in this game and expect to win. Miracles only come once in a while.”

The Bears suffered key injuries early and late in Sunday’s loss. Wide receiver Bernard Berrian hurt his ribs while making a 10-yard reception on Chicago’s first play from scrimmage and did not return. He was replaced by Justin Gage, who had two receptions for 51 yards.

All-Pro middle linebacker Brian Urlacher then hurt his foot while making the tackle on Ronnie Brown’s 1-yard run on third-and-goal from the 3 with 1:13 left in the game.

Asked if Urlacher’s injury could be serious, Smith said: “I hope not. We’ll evaluate him and go from there.”

The Bears defense allowed three touchdowns Sunday after permitting four in 40 quarters during the team's 10-game home winning streak. The 31 points were the most that Chicago has given up at Soldier Field since a 31-14 loss to the Packers in the 2004 season finale.

Tommie Harris and Hunter Hillenmeyer sandwiched Joey Harrington on this play, but the Bears failed to register a sack Sunday for the first time this season.

Ronnie Brown rushed for a career-high 157 yards on 29 carries. It was the second time in as many games that an opposing back topped 100 yards against the Bears, with the 49ers' Frank Gore gaining 111 yards on 12 attempts in Chicago's 41-10 win last Sunday at Soldier Field.

“I just saw guys trying to get to where they needed to be way too soon,” said defensive coordinator Ron Rivera. “If you’re going to get over, you’ve got to go through your gap first and guys were just trying to make plays and because of that they gashed us a couple of times.”

Robbie Gould made a pair of 38-yard field goals, tying Kevin Butler’s franchise record of 24 straight field goals. Gould's first kick gave the Bears a 3-0 lead late in the first quarter and his second drew Chicago to within 21-13 late in the third period.

The closest the Bears got after Miami’s two TDs in :15 came when Grossman’s 30-yard TD pass to Muhammad made it 14-10 with 1:57 left in the first half.

But the Bears committed their fourth turnover on the first play of the third quarter as safety Yeremiah Bell forced Gage to fumble after a 17-yard reception. Cornerback Andre Goodman returned the loose ball 33 yards to the Chicago 12, setting up Harrington’s 6-yard TD pass to Wes Welker that gave the Dolphins a 21-10 lead.

Safety Renaldo Hill later picked off a Grossman pass and returned it 12 yards to the Chicago 24. Harrington’s 24-yard TD pass to Chris Chambers on the next play then increased Miami's lead to 28-13 with 10:00 remaining in the fourth quarter. Olindo Mare provided the game’s final points with a 20-yard field goal with 1:09 to play.

The Bears will look to rebound from their first defeat next Sunday when they begin a difficult stretch of three consecutive road games against the New York Giants (6-2), who’ve won five straight since their bye week.

“We know what kind of football they’ve been playing the last few weeks,” said tight end Desmond Clark. “It’ll be a big one. We’re looking forward to it. We’ve got to get this bad taste out of our mouths.”