I got that by now. The problem I'm having now is that the unit periodically resets, and after resetting enough times it stops mining and I have to unplug, restart and reconnect the unit to get it mining again (simply restarting cgminer isn't enough). Just before reset event I see errors like "usb_write_error on avalon_write" or "Avalon: Discarding 11 bytes from buffer".

Is there a solution to this? I don't mind the resets per se, but in about an hour or two, the hashrate drops to zero and I have to restart the miner, as I said. Maybe some buffer is getting stacked up?