Riding Lawn Mowers

I have a yth24v48, its only 1 year old and approx. 22hours on it,recently i'll hop on and it doesn't start, not even turn over just nothing. I have head lights and the pto engages. so I checked all the wires, battery, starter under seat switch etc. now if I walk away and come back to it later it fires right up and will restart all day long but next time around same thing, any suggestions? Thanks