smu 236 incorrect output

Hi 

I am using a Kiethly 236 SMU to measure IVs this normally works fine, but appears to have an intermittent fault.

Sometimes when performing a series of measurements the first outputted current file is correct, however all subsequent files give the same dataset with a random offset. Restarting the pc seems to resolve the issue.

I have recently discovered that a colleague has been altering the pc date and time settings, could this somehow account for the incorrect data?

Any help or ideas would be gratefully received.

Thanks