Purchased new a year ago. Everything fine till today. Was in the middle of mowing and she shut off like I turned off the key. Now she cranks and cranks but no start. I think I checked all of the important items. Plenty of fuel, filter clean and full. Checked safety switches, seat and blade, and 20 amp fuse. Could it be in the engine? Like magneto or something else? Have Briggs & Stratton 21 hp ohv.