I have two Specialized cross trail bikes, one elite and one carbon fiber. On the elite I lost the nut on the left side of the crank arm attaching it to the lower bracket axle after only about 300 miles of riding the bike. The dealer replaced it under warranty. After logging about 400 more miles I recently lost it on a ride from Key Largo to Key West. We were about 12 miles from Key West when the left pedal felt sloppy and I realized I had lost the nut again. I had to carefully ride the last 12 miles w/o the nut. The nut is atypical so is a special order. A Specialized dealer in Key West said that after a second occurance I should ask Specialized to replace the entire crankset. I have a friend who also owns the same bike and has had the same problem multiple times. He carries an extra nut and wrench. Has anyone else had this problem and if so what has been the response by Specialized?