This post was very helpful for me.
On a trip to Florida my stairs became erratic, opening and closing as we drove. I pulled the plug and wire tied the stairs up. I replaced the motor once I got to my destination. We stayed for 6 weeks assuming everything was cool, it wasn’t. As we rolled down the road the same thing happened. I pulled the plug and wire tied the stairs again, the motor was hot.
Someone pointed out that it maybe the magnetic sensor.
My apologies for not adding your quote to this post.