Turnovers and a shaky defensive performance turned a 21-14 deficit at halftime into Cambridge's fourth consecutive loss.
Quarterback Michael McDermott passed for three touchdowns but also threw four interceptions, one returned for a touchdown. The Lancers also fumbled twice, allowed Canterbury to return two kickoffs for touchdowns, and their defense struggled to contain running back Brent O'Neal.
"It was an ugly defensive second half and a mixed-up offensive game," Cambridge coach Bob Dare said. "We had some good plays, but we definitely had some bad plays."
After a promising 4-1 start, the Lancers have dropped four straight. Victory Christian (9-0, 5-0) and Admiral Farragut (7-1, 5-1) have a strong hold on the top two spots in the district.
"We're just trying to hang together, persevere and build something for next year," Dare said. "I'm proud of their effort."