webcam stop working since I use USB hub on my printer

[xTremePower]

Hello,
I run mjpg-streamer with an USB camera on all my Elegoo Neptune 4 Max printers,
They run on OpenNept4une firmware, and they work great as webcam and for Moonraker Timelaps

But last week I upgraded one of my Neptune 4 Max with a Coprint KCM + ECM and I need to use a 6 way USB hub,
When I start the printer, the USB camera work perfectly, even in Timelaps, but after some layers he stop working totally, the only way to start the webcam again is to restart the printer complely.

Do you have any idea why he does this ?
I don't see any errors in the log files

[binbon2d]

I have the same problem with Neptune 4 Plus. Do you know the cause and how to fix it? Please share with me.