not any access to CIFS shares at boot from Windows 7 for a few minutes

Hi,

I have a problem with my CIFS shares, when my windows 7 PC boot on domain user , for someminutetheCIFS sharenotjustbeopenbut after a fewminutesit becomesavailable..

Occasionally sharing disappears so unexplaine !

Haveyou an ideaof the problem ??

Thank you for your help
Have a good day