Puzzling to envision how static electrical charge could cause a net force on the balance beam to make it stick. The beam is electrically isolated by the knife bearings, but even if it did build up a static charge and the charge exerted a net force, the beam would be deflected, not stuck. Far more likely is that the bearings are dirty. My old RCBS (Ohaus) is almost 50 years old. When leave it lying around uncovered too long it gets a little sticky and balky. A mild blast of compressed air always solves the problem. Reloading scales are not laboratory grade and have a bit of hysteresis and a dead band around the zero level. My habit is to drum my fingers on the adjacent surface to make the scale beam vibrate ever so gently and creep to its equilibrium position. It repeats every time, but it's slow. With all those drawbacks and slow use, I trust it implicitly over cheap electronic scales. Gravity never goes out of calibration.