KEYLAB 88(legacy) cause crash(hang) in Ableton Live 11, about 10 minutes after launching

[bspark]

System info:
OS: Windows 11 Pro 21H2(Up to date)
CPU: AMD Rygen 5 Pro 4659G(3.70GHz)
RAM: 16.0Gb
DAW: Ableton Live 11.0.12
Audio Interface: Focusrite Scarlett Solo(Gen 2)

Please help.
KEYLAB 88(legacy) cause crash(hang) in Ableton Live 11, about 5~10 minutes after launching.
The DAW hangs - not a immediate shutdown but only notes playing works, everything else don't.
It'll show (not responding) on the title bar and won't react to any other inputs.

so far I've tried
- updating the OS, Audio interface drivers, VST Plugins, MIDI Controller drivers, Graphic driver,
- Factory Resetting the KEYLAB 88 unit, Ableton Live config files,
- re-installing Ableton Live(5 times), All Arturia Plugins,
- trying different USB ports, cables,
- disabling 'power saving for USB ports' in Windows Device Manager,
- turning off / disconnecting each USB connected devices one by one.

and I found out that
when I turn the switch of the KEYLAB 88 unit off, the DAW would turn back to normal state and works fine again.

but when I turn KEYLAB 88 on again, the DAW would show problematic status, graphic feedbacks would be slowed down, not smoothly but with very low framerate(around 5~10 fps), and would crash when I shutdown Ableton Live. If I keep KEYLAB 88 turned off, Ableton Live would shutdown fine without crashing.

And then I've noticed that when the KEYLAB 88 is on, Key/MIDI Out Indicator in Ableton Live would be always on(light blue square), so I've tried turning the controller surface in Preferences from 'Keylab 88' to 'None', than the flashing light blue square would be gone, and slow framerate problem disappears too.

Screen_2022-02-03 134557.png

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Another thing I find odd is that

Screen_2022-02-03 135605.png

In Factory Templates Default,
Param/Category encoder is set to CC Number 114, which is for choosing presets in Analog Lab,
not set to CC Number 112, which is supposed to be, for choosing categories in Analog Lab.
I think the factory default is faulty but don't know how to fix the factory default value.

Please help.

[arturiaguy]

Under the MIDI setup of Ableton preferences, under "Control Surface", change "Keylab88" to "Keylab Essential". Input and output stay the same. Should clear things right up if you have the same issue I had. You described my symptoms exactly as I was experiencing. I hope this works for you like it did for me.

[bspark]

Thank you for your advice.

Actually, I found another workaround, that is
When I open Ableton Live, Choose Keylab 88 control surface, both input and output.
The little square at the top-right corner would start flashing.
Then I choose 'None' at Output section of Keylab 88 control surface.
All the hanging/crashing/slowing down problem is gone. Everything works fine.

I found out that this way I could use all the features of the Keylab 88 properly.
(choosing analog lab presets, transport, faders, knobs bank 1, bank 2)

I believe that the Keylab Essential has different set of buttons and scripts so that some of the buttons won't work as intended when the control surface is used on Keylab 88.

It seems that the control surface script is checking something on the hardware,
supposed to check only once when connected newly,
but not getting the signal to stop checking properly so that keeps trying,
causing the hanging/crashing/slowing down problem.