Check the following:-
1. Disable disk caching. See:- http://support.microsoft.com/default.aspx?scid=kb;en-us;324805
2. Disable offline files See:- http://www.sevenforums.com/tutorials/48829-offline-files-enable-disable-use.html
3. Disable autodisconnect See:-http://support.microsoft.com/default.aspx?scid=kb;en-us;297684&Product=win2000
4. Disable OPLocking See:- http://support.microsoft.com/kb/296264

>This long-running VFP6 application started having internal consistency errors a few months ago and someone called me for help.
>The occurrences are unpredictable but fairly frequent.
>The W/S in question is Win 7, but I don't know much more.
>Any ideas before I start looking at this would be much appreciated.