There are cases where the NetBIOS name resolution on the local machine can get out of sync against other machines IP address and host name. This can happen when the machine has been turned off for a few hours and the IP getting reused.
Since file sharing and any other network related activities in Windows commonly uses host name then this can get problematic if you need to access network shares. Now to fix this out of sync scenario, run the following command:
This should clear the local name to IP cache.