What Dutchmen said. And you didn’t specify what hitch you are using. That might help “us” help you.
One thing that happened to me once - my hitch Ball came loose. I started noticing something was amiss and started really looking over my setup. I paid no attention to the ball at first, but finally I saw that it must have moved and got a hold of it. Sure enough I could move the dang thing with two fingers! Shame on me and lesson learned. Visited a friendly local RV dealer and they had one of their service guys get it tightened back at no charge. Now I check it and the other parts a LOT more closely at every hitchup.
Also not mentioned: You don’t happen to use a sleeve in your receiver by any chance? I doubt it but that’s another source of slop.