At the final stages of migrating from SBS 2003 to SBS 2011. Server is rock solid until I run a robocopy job that copies the data from old server to new server. Nothing complicated. Process starts then at some stage (varies), error message pops up "You are about to be logged off. Windows has encountered a critical problem and will restart automatically in one minute. Please save your work now."
Any ideas on what to look for... Have applied almost every patch I could find reference to to no avail.