I was on my third yard this morning and I went to fire up the turf tracer HP, and it started but I have never heard a mower sound like this did, The best way I can describe it is to say it sounded like it was only half on? So I shut it off quick,waited a few seconds and tryed again, it sounded the same way but after a few seconds the other "half" kicked in and it ran like normal the rest of the day. What was this? This is the mowers 4th season and I am hoping it lasts for another couple weeks until I can get another mower. It does get a ton of use. Anyone else have this happen?