Some windows 7 laptops cannot access DFS namespace - windows cannot access \\domain.com\dfs\data

Hello,

We are seeing an issue where we have around 10 win 7 laptops and 3 of them cannot access a DFS namespace.

If they go to \\domain\dfs\data they can access it but if they go to \\domain.com\dfs\data they get a windows cannot access message.

I tried disabling offline files and rebooting which resolved the issue but the question still begs why can some machines with offline files enabled still access \\domain.com\dfs\data?

Our DFS infrastructure is running on all Windows 2008 R2 enterprise servers.

Thank you.