Sounds like the wireless link is on the edge of good reception, so you are either getting USB errors or the device is dropping off the USB bus and reconnecting. Do you get the same problems if the devices are close to each other (and you only use one at a time so they don't interfere with each other on wireless)?
Is it possible to wire into the device to bypass the wireless connection and see if the problem solves itself? Would narrow it down to the wireless link.
Wim
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