Are you working with the correct scan definition? For example, if 'Flatbed' is set in the scan definition, then one sheet is fed from the feeder in the best case.
Further you should check if the scanner is switched on at all and connected correctly. Scanners with a USB connection should be connected directly to the front panel of the ArchivistaBox. If a scanner is switched off and then switched on again, it is generally not necessary to restart the ArchivistaBox. Only if the scanner still does not respond after switching it on/off several times does the last option remain to restart the ArchivistaBox. See 33.4 and 2.3.