I have a question about my Shimano SPD (2 bolt-type cleats). Do they become harder to clip out of as they become worn out? I had a slight fright at a stop light the other day. I kicked my foot out, but the cleat didn't disengage. Luckily, I was still moving a little bit so I didn't keel over in front of everybody. I gave it a second try and it disengaged. I tried another pair of shoes that I have with newer cleats on the same pedals, and it does not seem bad at all. Just wondering if it is time to replace.