Find what changed. Either permissions on the directories ( /v/sysadmin/sysnet/ ), crontab file (could have an error on that line that you don't realize), permissions for the user running the cron job (if not root - acl's put in place... ).
I would not think if it WAS working, that insuring the environment is set will do any good - you probably had that straight before (double check that no one changed your .profile or the system profile).
Can you find any error messages in log files? cron.log, messages, ... Post your OS/version for more assistance on that.