Zend certified PHP/Magento developer

QNAP SMB changed how I authenticate

Can anyone explain to me why after a power outage I now need to authenticate an SMB share to my Qnap NAS as DEVICENAMEUSERNAME as compared to just username?

I have two SMB shares on it and one only works if I specify the devicename before the username. If im coming from another device, I only have to specify the USERNAME and I cant find a reason why.

Thanks!