Kubota rtv x1140 issue while going down hills

[Mikewilson33]

Hi- just picked up a 2018 Kubota rtv x1140; appears in great condition and with under 800 hours. Runs perfectly except when going down a hill: as soon as it picks up enough speed that it’s rolling more from gravity than from the hydrostatic transmission, it seems like a governor kicks in and it loses all power (will still rev, and engine sounds fine, but as though it’s in neutral) until it’s slowed almost down to a stop. Then works fine again. Happens even on very moderate downgrades and at fairly low speeds (under 10). Anybody have an idea of what I’m doing wrong, or what’s wrong with the machine?