Why does Error 8 pop up during routine datalogging

During routine datalogging of temperature, an Error 8 dialog box suddenly pops up (sometimes after several hours of successful logging) and causes the logging to stop, as well as freezing up the real-time temp graph. I have not been able to correlate the error with anything in particular. Can you help me troubleshot this problem?

Is by any chance you are running FastFind (or FindFast) ? It is a beast that comes with MSOffice.
Disable it. It tries periodically to open text files to index their content in order to speedup searchs within documents and slow down every other application. It opens the files to read them while you are using it and DENYING you further write access until it is finished.
An antivirus scan might the same effect.
When you open a file with LabVIEW, the default is to allow other processes to open it simultaneously for read and write. This is seldom required and causes this Error 8 when one process deny writes to other. Thus when you open a file, use the deny mode and set it to "deny read/write"(0). That will prevent other apps to use your file while
you write on them.
LabVIEW, C'est LabVIEW

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