USB ports blocked using USRP v01

Hello everyone,

I’ve got two USRPs and boards integrated are XCVR2450 Transceivers. I
want to transmit data from one USRP to another one using the code found
in benchmark_tx.py and benchmark_rx.py. I also implemented a code to
configure automatically the transmission frequency when there is some
degradation of the quality of the transmitted signal. My code works well
but sometimes, when the USRPs configure automatically the transmission
frequency, the USB ports stop to work (I cannot even use mouse and
keyboards!) and I need to restart my computer and run again the USRPs.
Can anyone explain to me the reason of this problem? Thank you in
advance.

Best Regards.