Windows 7/xp sharing issue

I recently deployed a new windows 7 workstation that was built from an image. 3 other PC’s were deployed days before this one with the same image and not experiencing this issue. What is happening is that every so often any other workstation that is running windows XP loses the ability to connect to the shares on this windows 7 machine. When the windows 7 user reboots the PC, all works properly for a few hours, days, etc. The computers are on a domain and not on a workgroup. The firewall on the windows 7 PC is totally disabled. I have searched online at this issue but not finding anything that is fixing my issue. Any suggestions? Thanks.