Aeon Z-Wave Stick not responding randomly

I am running openhab 2.4.0-1 with Aeon’ Zwave Stick on USB /dev/ttyACM0 (raspbian.)
The usb is not plugged in directly due to this nasty USB bug on the raspi, hence the stick is on a USB hub.

Sometimes my zwave devices are no longer available since I can not send / receive commands.
The stick is still shown as online and I also tried to do a soft-reset. but that does not bring the device back to normal. The only way to get it back to normal is rebooting the entire system.
Also restarting openhab does not help.
I also dont see anything suspicious in the openhab logs and event logs.
So I somehow suspect USB ?!

Where should I start do debug this issue?
How could I check (periodically) that the usb is still working fine?

Help is appreciated.
Thanks in advance and kindest regards,

2.4.0 is no longer supported and 2,5,x is no longer being developed. 3.0.1 is the current stable release and there are Milestones of 3.1.0.

Actually it is a nasty bug in the stick not behaving according to the USB standard.

Did you follow the zwave binding docs and enable DEBUG logs for troubleshooting?

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