I bought a 2000 Kubota 2710 hst 4wd in July of 2011. The Kubota dealersip had put a new clutch in prior to. I used it for 10 hours and had to replace the clutch. I used it again for 12 hours and the clutch came out again today. It's getting very frustrating, not to mention Expensive. Anybody. What's going on?