The Dallas Cowboys reached their bye week with as many losses as they had all of last season.At 2-3, Dallas is spending part of the week evaluating what's been good and what's been bad the first five weeks.Here's a tip sheet for the Cowboys to save them some time; here are five things that have gone wrong:* The defense isn't taking the ball away and struggling again: Stop me if you've heard this before: The Cowboys defense is having a hard time slowing down opponents.The Cowboys allowed a total of 112 points in their three losses before the bye.