IS700z Busting Belts Right & Left

Our nonprofit wildlife sanctuary bought a new Ferris IS700z last summer to replace several hand-me-downs that we'd been struggling to keep running the previous summer. It was the biggest expense single expense we've taken on in years and we were really excited to get it. Our excitement quickly turned to frustration when our drive belt broke with less than 3 hours on the machine. Within a week the deck belt had also broken. This machine is less than a year old and we have now replaced the drive belt 2x and the deck belt 4x. WTH is going on? The dealer took it back to the shop last month to check all the pulleys for burrs and found nothing. Another dealer suggested we check to make sure the engine is not loose - it's on hard as a rock. The dealer who sold it to us believes that sweetgum balls and pine cones are getting caught under the belts causing them to break - but this much? Can anyone else recommend any fixes. We are about $600 in on maintenance for this thing in the first year for belts alone. Not very happy with Ferris right now.

Thank you!