I have read about this happening, though have not personally experienced it on either of my Palomino trailers, a Sabre and a Columbus. If it is under warranty, you might consider requesting that both axles are replaced with 7,000# axles as yours probably has 6,000# axles now. There usually is an I.D. Sticker on the axle tube. If it's not under warranty, contact Lippert. Good luck.
2013 Palomino Columbus 320RS
2007 Dodge RAM 2500 6.7 Cummins
Reese 15K manual slider
M.I.L. in Florida for good!!