Belt Issue?

[Sponge60]

Hello all. My 24 XP Northstar has started struggling to move smoothly when using very light throttle. (as in moving it a short distance) It "lurches" pretty heavily in forward or reverse. Hitting the gas harder doesn't seem to produce the same issue. Really hadn't noticed it until very recently when I was moving it around it's parking spot in turf mode on concrete. 1,800 miles. Is this a belt issue? It's not been run hard, stuck or towed anything.