I just bought an orbital sander, my first, and it is held by the palm from right behind the motor rahter than by a handle.
If I bear down on it even a little, it appears to stop spinning. I can't tell if that's actually the case or an illusion, since the vibration still makes it blurry, but I can see at the least that it speeds up when I all but remove all pressure.
The user manual says it has a mechanism to slow it down when it is NOT in contact with a sanding surface, but this seems to be the opposite behavior.
Normal? The brand is DeWalt.