Winch problem

[16flippinb]

Hello all, we are having a problem with our winch not holding tension. When we stop pulling the boxes off of the ground, and reach the desired height, the winch begins to unwind very slowly. The more totes and cans we have, the faster it unwinds, and vice versa. We are using a CIM motor to a Vexpro base versaplanetary gearbox with a 1/2" HEX output. The gearbox is attached to a flywheel that winds and unwinds the winch. Is this a problem with our programming, the gearbox, or something else? Any advice would help! Thanks -Team 5216