RQS and visa on wait

Hello!
I have Agilent 35670A signal analyzer over GPIB. For the past three months or so, it has been working fine. However, since last week, I seem to have a problem with it, especially with visa on Wait.vi.
What happens is that Labview waits and wait without processing to a next vi even if the instrument has finished its job. The particular vi that is problematic is called "run.vi", in which, by highlighting the execusion, I have found that the vi named as "wait on RQS" is not responding at all.
I was previously using Labview 7.1, but when the problem started, I upgraded it to the version 8, but without any success of getting rid of the problem.
Looks to me that the instrument lost the communication with the labview, and the labview is still trying to communicate with it. Only this specific function causes trouble and the rest of the function, such as obtaining the data itself (without having the labview to run the instrument) works OK.
Any suggestions?

Hello,
thank you for your reply.
I am LabView beginner and try to measure the frequency response of actuator with LabView 7.1 and Agilent 35670A signal analyzer.
When I test one sample, it works OK, but when I measure next sample(new one) again, I get the following error message.
Error 1073807339 occurred at VISA wait on Event in Wait for RQS.vi
It happens almost same with havenoidea's. LabView wait and wait ("Wait on RQS.vi is not response at all") even if the signal analyzer finished the measurement, then I get the error message. ( but I get the result from the signal anayzer). In this case the sweep frequency of the signal analyzer (from 2Hz up to 50KHz) changes very slowly.
I use Window XP and NI-488.2 ver.1.70 in my PC.
I attached the related VI for your reference. 
Thank you
Attachments:
Frequency Response.zip ‏319 KB

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