Vibrate Issues?

[Robtao]

The vibrator obviously has to rotate, and being mechanical, there may be pressure applied the way it is all assembled. Opposite pressure applied relieves the friction, or realigns the coils or bushings, or whatever, and frees up the mechanism.

It may or may not be the same hardware for different models, but the principle is the same.

There may also be other models which by use of a different vibrator, are less susceptible to the problem.