I have a forklift which uses a prismatic constraint to raise and lower the forks. But recently, a new behaviour has emerged where the forks will slowly lower as the forklift starts rolling and gains speed. This has never happened before.
As seen in the video below, the forks lower themselves as the speed picks up.
I have included a model of the forklift. Press R/F to raise/lower the forks.
A private message is associated with this bug report