I have a MX5400 hstc that occasionally will not start (no fire to the starter), but not because of PTO switch being engaged. I try wiggling range selector, hstc pedal, ect., basically anything that might connect to a safety switch but I have yet to determine what I move that allows it to turn over. This doesn't happen all the time and usually I will get it started but it's definitely a nuisance! Anyone else having this problem and if so what's your secret to fixing it?