Sounds to me like there is something wrong inside the sway control column, like perhaps some of the frictional material came loose and it getting bunched up in a certain area maybe? It also seems like it could be affected by temperature and the corresponding expansion/contraction of metal parts since it sat overnight and then started acting up again.
Can you pull the ball and shank out and look inside to see if there's anything obvious? I'm also assuming there is adequate grease in there too.
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2013 F-150 EcoBoost MaxTow, Roush tuned (415hp 506tq), lifted on 33s, R.A.S.
2013 Jay Flight 28BHS Elite (Equalizer 10K hitch)
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