You probably need some new silicone damping fluid. Try turntablebasics.com
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Haven't had any problems with my 5 in a dozen years of use, but what you are describing sounds exactly like what the dealer warned me against--don't tip the arm over with the damping trough full or some of it may get into the arm housing and screw up movement. I suggest you call Jim Alexander at Sumiko and ask him--he'll certainly know the answer and have a solution.