We just purchased one of the new Advantage 21 Exmarks since we needed a good push mower for a few small fenced yards. Weve had it for a week and today it will not start. When we picked it up from the dealer, they had a working demo on the floor that they said was having problems starting. I should of seen a flag there.. Anyone have a new 21 with this problem? Were taking it in to get it looked at.