BOISE, Idaho (AP) — Many coaches might be hard pressed to find flaws in Boise State's 49-14 shellacking of Hawaii.

But Broncos coach Chris Petersen is puzzling to explain another series of breakdowns and mistakes that enabled the Warriors to return a first-quarter kickoff for a touchdown, the second time Boise State has allowed a 100-yard return in the last two games.

Against San Diego State two weeks ago, the Aztecs ran back the opening kickoff for a touchdown and set the tone the rest of the way in their 21-19 upset of the Broncos. Then on Saturday, Hawaii's Mike Edwards answered a Boise State touchdown with another 100-yard return.

The Broncos (8-2, 5-1 Mountain West) were able to overcome Edwards' dash and went on to score the next 42 points and put the game out of reach. But Petersen says he's concerned about the recent lapses on special teams — an area Boise State has come to dominate in during his seven-year tenure — and he blames injuries, poor tackling and focus for a drop-off that has the Broncos ranked an uncharacteristic 58th nationally in kickoff return yardage allowed.

"There's something we need to fix, no question about that," Petersen said Monday. "We need to tackle better. Guys need to get off blocks a little better. I think the health of our team has showed up there. So it's all those things."

There may also something to be said of the players returning kicks. Edwards' touchdown was his third of the season and he ranks seventh nationally in kick returns, averaging 31 yards per return. San Diego State's Collin Lockett has two TD returns and ranks 27th in the country.

"There's excuses for everything," Petersen said. "That's not what we're all about here. It's not any one thing. It's just interesting how in a couple weeks we can go from a great kickoff coverage team to all of a sudden we're on our heels."

Injuries and player discipline issues sure haven't helped the cause.

The Broncos are playing without at least four key players from their kick coverage unit, including starting safety Lee Hightower and freshman tight end Hayden Plinke, both of whom have missed three games for violating team rules. Another important cog on kick coverage is nickel Dextrell Simmons, who was injured against Wyoming Oct. 27 and appears ready to return to action Saturday when the Broncos play their final home game of the year against Colorado State (3-7, 2-4).

The Broncos remain in a tie for first place with San Diego State, which closes its season Nov. 24 against Wyoming, and Fresno State, which plays its finale the same day against Air Force.