This is what I got from musical surroundigs when I had same issue.
"Sometimes the lubricant inside of the cueing assembly hardens due to temperature swings (for example in shipping) and this causes the cueing assembly to get "sticky." We suggest leaving the arm in its rest (protect the stylus) and gently press a finger on the cueing lift platform, preferably over the attaching screw. Then raise and lower the cueing lever perhaps a dozen times keeping gentle pressure on the cueing platform. This usually solves the sticking problem--if it does not, then you should return your arm to your dealer for service."
I still have the same issue but just live with it.
"Sometimes the lubricant inside of the cueing assembly hardens due to temperature swings (for example in shipping) and this causes the cueing assembly to get "sticky." We suggest leaving the arm in its rest (protect the stylus) and gently press a finger on the cueing lift platform, preferably over the attaching screw. Then raise and lower the cueing lever perhaps a dozen times keeping gentle pressure on the cueing platform. This usually solves the sticking problem--if it does not, then you should return your arm to your dealer for service."
I still have the same issue but just live with it.