Switch frequency with Usrp2 can only succeed about 20 times

Hi guys,
I am using an USRP2 with Gnu Radio and XCVR2450 as daughterboard. I want
to
switch frequency among different channels 2.4G~2.5G. However, I find
that
when switch only can succeed about 20 times, then fails. Is there any
body
having the same problem?
The python code is:
self.tb.lock()
ok = self.tb.txpath.set_freq(new_freq)
if not ok:
print “Failed to set Tx frequency”
raise SystemExit
ok = self.tb.rxpath.set_freq(new_freq)
if not ok:
print “Failed to set Rx frequency”
raise SystemExit
self.tb.unlock()

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