That is strange.  Can you please also upload as separate attachments
   sudo dmidecode > dmidecode.txt

Unplug the device and rmmod/modprobe the appropriate modules until the cycle 
should work again, and run
   lshal > lshal_1.txt
while the device not the monitor) is unplugged.

Now open a separate terminal and run
   lshal -m
leave this running...

Then do your device plug in and unplug cycles until it doesn't work anymore and 
run in the original (or new) terminal, run
   lshal > lshal_2.txt
while the device (not the monitor) is unplugged.

Please upload the lshal_1 and _2 files and copy and paste the lshal -m
output here as well.

Thanks in advance.

-- 
usb hub disappears after one use
https://bugs.launchpad.net/bugs/332643
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