Has anyone out there had a problem with their shoes that made them fall running more than usual? My wife bought a pair of shoes recently and on a training run she fell on pavement. Then a week later in the same shoes, she fell running on a dirt trail. She has never fallen before and she does not understand why she fell. She has complained about the shoe being to loose in the forefront and part of her foot going numb after a long run. Please let me know if anyone else has experienced this before. My wife, a new runner- loves the sport but now she is feeling like maybe she should not run or race any more.