HP4275A can not pass self test after running the labview program

I am using Labview to control HP4275A LCR meter. The Labview program is just the instrument driver for the HP4275A, and it works great. Before running the program, the instrument can pass both Open and Short test perfectly. But after running the program, it can not pass self test, neither Open nor Short. I don't know why?? Is it relative to my Labview program??
Thanks

Thank you so much for your help. Yes, the instrument is in Local after running the instrument driver. In normal Open self test, just choose Capactiance as the Display A, and leave the four output terminals open then press the Self Test button. The Open self test will start and "OP" will be shown in the DIsplay A window, after 2 seconds, the open test will be finished. If something abnormal, the number of the abnormal step is displayed in Display A. Similar with the Short test.
The problem I had was: before running the instrument driver, the self tests pass; but after running the instrument driver, the Open and Short test show abnormal, Open test is abnormal at step 17, and Short test is abnormal at step 24.
And the instrument driver is only write commands into the instrument and then read back measuring values from it. Nothing else. So I am not sure if the problem is my instrument driver.
The weird thing is the problems happened several times and then if I do the Open and Short self test again after running the instrument driver, both pass. I am not sure whether the problem will come back or not.
Ia there any help??
Big thanks

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