-------- Original-Nachricht --------
> Datum: Thu, 08 Nov 2012 09:32:18 +0100
> Von: "Stefano Di Martino" <stefan...@gmx.net>
> An: pyusb-users@lists.sourceforge.net
> Betreff: [pyusb-users] Devices disconnects after several request

> I don't no why, but in an older version of my project, pyUSB didn't even
> care when I called this function every second! I didn't even  change the
> version of pyUSB or libusbx!

Meanwhile I think I just didn't notice this problem before, because in my newer 
versions of my project, I have a better error handling than before. My older 
versions just ignored some errors. So, I think this is a general problem and 
the USBError occurs always on this line in get_devices_connected_to_usb_hub():

devices = usb.core.find(find_all=True, bDescriptorType=usb.DT_DEVICE, 
bus=usb_hub.bus)

But never on this line:

usb_hub = usb.core.find(idVendor=usb_hub_vid, idProduct=usb_hub_pid)

Best regards
Stefano

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