I have a client that uses one (1) domain user account to login to all 16 computers on his network (holdover protocol from previous setup for simplicity purposes). We just recently upgraded to Windows Server2012 from Server2008 for his single network server. All clients are running Windows 7 64 bit and logging into the network using the same AD user which has Admin rights on local computer (this is a requirement of the software they are running). Since the upgrade there have been several computers that, on occasion, will lose their local profile and come up with the default profile. This is not a predictable occurrence and has only happened to 4 or 5 client computers on a sporadic basis (once a week or so) some on more than one occasion. We've been resolving the issue with a system restore which seems to work but gets annoying and takes time to run. Would there be anyone with an idea as to why this issue occurs and what I can do to relieve the situation? Thanks for you input!