Issues with usrp_spectrum_sense.py and B100

I am having gnuradio version 3.6.5.1 which I installed 3 weeks back with
build-gnuradio script.
I am running usrp_spectrum_sense.py on B100 (Serial EDR13W5B1)

When I run it it simply gets stuck and not responds to ctrl+c , then I
have
to forcibly kill the process.
At the same time in another machine, it runs cool and responds well to
ctrl+c

Another issue is while running usrp_spectrum_sense.py, in one machine
the
noise_floor value keeps fluctuating(thats good) but in another machine
it
gets stuck a single value and never changes !

What can be the issue
Let me know if any other info is required.


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