[Discuss-gnuradio] Can static cause USRP work inproperly?

[Songsong Gee]

At least, until the day before yesterday, my flow graph works fine with USRP

TX: https://picasaweb.google.com/lh/photo/FVqGp6Qt39P3nP-DLzm2pg?feat=directlink

RX: https://picasaweb.google.com/lh/photo/rKCvVTq9Ptst_u2Z0TvCDw?feat=directlink

Suddenly, however, yesterday received signal strength is much lower than normal

TX: https://picasaweb.google.com/lh/photo/Ntw86qudmxB4Qu07Z1TNvQ?feat=directlink

RX (normal): https://picasaweb.google.com/lh/photo/H9RItzjpfemHy-OR2eQhQg?feat=directlink

RX (abnormal): https://picasaweb.google.com/lh/photo/jJdZIfm6Fd_mGNwu9QRBYQ?feat=directlink

It looks like just a noise, but it's a kind of rectangular pulse. (Just, signal strength is similar to noise)

RX in normal shows count with about 1k but RX in abnormal? count with just tens

How could it happen?

I changed nothing but just turning on and off the USRP