Just wondering if anyone has experienced any problems with the Scott Spark frames? I purchased a Spark 50 about 6 months ago and the rear triangle cracked completely through on the bottom stay close to the main frame. Had the rear triangle replaced and frame upgraded to a Spark 40. Have ridden the bike maybe half dozen times around manly Dam Terry Hills etc. Last weekend the frame cracked in exactly the same place on the rear triangle after about the same amount of riding as the first round.