I have a simplicity legacy 25H air cooled with 950 hours. I am the original owner. I mow 3 acres. Last September about an hour into my mow I turned the mower off went into the house came back out and it wouldn't start. Crank but no fire. Could not get it to run! Had it picked up the next day and into the local simplicity dealer. When he looks at the tractor it starts without hesitation. Runs perfect repeatedly. So I get the mower back and mow the rest of last year perfectly. This year I have mowed 6 times with it and yesterday it does the exact same thing. I was mowing with it for about 2 hours straight, get off the mower and get back on to finish and nothing. It cranks but no fire. Tow it back in and the next day it runs perfectly for them. I have no idea what it's doing! Electrical maybe but very intermittent? Please advise. Thank you.