I have been running one for almost 5 years without much trouble. She's about to hit 3000 hours. I have never had a belt problem. Only changed them once and will change them next week. Sounds like your pulleys are not aligned or something is stressing your belts.
My only problem has been the overheating issue if I go too long without flowing water, but no big deal. She fires up every time I hit the key and gets em clean.