Connected to 34970A via GPIB to USB adapter. Getting this message every couple of minutes, reconnects OK. No issue when connected to instrument with Data Logger Pro software.
Most likely, you are using the 82357B USB-GPIB adapter. It does not function correctly on GPIB addresses 9,11,13,25,27 and 29. The default address for the 34970A is, unfortunately, 9. Changing it to a different unused address that's not one of the bad ones will fix this problem.
Desktop or Laptop?
Check device manager for USB Host power management option; see attached
Retrieving data ...