The problem is that the provided toolfans are quite sensitive to magnetic fields. I installed thin steelplates 3x4cm between the fans and the Hytera's stepper motors which solved all of my problems! https://jan-griffioen.synology.me/en/e3d-toolchanger-hymera-fans-24-6-and-8-intermittent-problem-solved/

The problem is that the provided toolfans are quite sensitive to magnetic fields. I installed thin steelplates 3x4cm between the fans and the Hytera's stepper motors which solved all of my problems! https://jan-griffioen.synology.me/en/e3d-toolchanger-hymera-fans-24-6-and-8-intermittent-problem-solved/