deCONZ permanently loses the connection to the ConBee II Stick

Yes, but all on a powered USB HUB. The HUB is the only USB item connected to the RPi4.
The low power output on USB ports on the RPi4 is a design flaw. Also for ZigBee there is an interference issue, so the stick need to be away from the RPi4. Sometimes a simple extension is enough, but the foolproof solution is a powered USB HUB. Both USB2 and USB3 HUBs works fine, connected to any RPI4 port. (USB2 or USB3)

One post of many on the subject: HF Noise from RaspberyPi 4 - SatNOGS - Libre Space Community

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