Do you have the bec on the esc set too high for the winch servo? I thought the HW 1080 g2 had above 7.4v bec settings that maybe the winch doesn't like.
But also seems like it could just be a bad channel in the receiver. I had one where I saw the magic smoke escape and all but one channel worked after that.
The BEC has always been set at 6v. Just waiting on another receiver coming in