Not exactly but probably the solution. Now I tell you the whole story:
So I have this beautiful external effect unit called Vermona Retroverb - a spring reverb. Lately I heard some kind of computer noise on the output signal of the unit. It's that noise you get from the hyper aggresive energy saving mechanism of the modern CPUs. I know because if I take the CPU under heavy load with something like Prime95 the noise is gone and with my old pc I had none such issues. So I changed audio cables, excluded the usb connection of the UCX, changed the position of the psu and so on to finally got a change of the noise by moving the whole unit away from its current position. While doing that the spring reverb reacts to low frequencies very sensible. So I switched the auto leveler on for security of my ears and headphones.
After excluding the mouse and keyboard I realised that my tft was emitting the noise. Solution? Changing the power cabel! Unbelievable.
The noise wasn't very loud so I needed some gain on the UCX to hear it better while moving the unit. It can happen by accident that the unit gets a small hit and reacts with high level low frequency rumble. So after a hit, levels fall after around 5 seconds to the noise floor which is under -60 dBFS. And the auto leveler got kinda stuck.
Now I realised that it is program dependent (kind of second threshold?) giving some more signal to the auto leveler helps to achieve a full release.
You really need to update that description in manual with more details how this thing works!
Now it looks like it's some "simple" clipping safety thingie with basic settings available. People will underestimate the complexity behind it. Any other details we should now? ;-)

With best regards
El Duderino