It is difficult for us to pinpoint the problem as we cannot reproduce your exact environment. As Block Mode helps your slow sampling, the problem still remains that real time data transfer is not possible.
Could you try an experiment with PicoLog? Try setting a 1ms sample interval for 10k samples in realtime continuous mode? If the problem appears here too, then we are looking at a USB host/RootHub driver problem.
Also, please try another USB port on your machine.
Michael - Tech Support
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