Click this LINK
for the Scan to SMB
setup guide which will walk you through the settings. If it had been working then stopped most likely just one setting has changed; the two things I would look at first is the password for the folder you are scanning to and and IP/Host Name of the computer you are scanning to.
Does your Domain require you to change your password on a regular bases? If so then the password set in the copier to access
the folder on the computer may have changed and the new password needs to be set in the copier.
Also the person that setup the scanning originally
may have set it to scan to the IP address of the computer you are scanning to but if the computer is setup for
a dynamic IP address the IP will change from time to time and then the copier will not be able to find the computer you are scanning to. Change the IP that the copier is set to scan to, to the Host Name of the computer you are scanning to and that will no longer be an issue.
The Scan to SMB
setup guide goes over these settings.
You can also call Kyocera's free help desk Monday - Friday 9 am - 6 pm EST at: 1-800-255-6482.