There are several combinations of RPM and analog belt pulley signal strength which cause the pulley, or an encased belt attached to it, to pop off like when a part is rotated in two separate conflicting speeds.

A few examples:

3 RPM ran into a belt pulley at a signal strength of 11 or 13, attached to an encased belt

Several RPMs can be run into a pulley at 13, attached to an encased belt, attached to a shaft, attached to an encased belt, then attached to a pulley, also at 13 (which should end up leaving the initial RPM unchanged).

An RPM of 16, run into a pullet at any number between 2 and 14 inclusive, attached to an encased belt, attached to a shaft, attached to an analog pulley at 13, attached to an encased belt.

This issue has been addressed in 0.2.3. Thanks for the report and feel free to re-open if need be.

highly pog