Remote access failing for one user, occuring multiple times daily. Any ideas why?

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Hi there,

We seem to be having a recurring issue with one user where the remote data access seems to crash often, and also it often states he is still in a company when he has previously logged off from that company.

We operate all of our companies via remote access, but it is becoming concerning to have these now (three a day) issues where the user loses remote data access. We are all concerned about losing any data entered and whilst we do regular back up's, we want to avoid any data loss.

Is there any obvious reason for the issue occurring so often with this user? We have five other daily users, who aren't currently having an issue. Is there anything on Windows that could be affecting him and no one else? 

Thanks,
James