Dear Sir, 
 
This question is hard to explain, because I am not allowed to attach my project here
I am doing wideband (50 MHz to 01 GHz) spectrum monitoring using USRP-2920. i am sweeping my carrier frequency in my desired band. I got an error sometimes after sweeping 2 times and mostly during 1st sweep:
 
Error that I encounter is:
The local oscillator did not lock within the allotted time.   
 
I have changed my Rx channel but still i am getting the same error.
Any suggestion or help will be valuable.
 
Best Regards.