I see you have already started discussion on this in the other thread…unless you see or raise to debug level on the IS and turn back the scheduler and let see if the scheduler goes back to suspended mode again and check the logs for more specifics and post in the thread.
Also make sure the IS has enough resources (threads) available when this particular scheduled job runs.
HTH,
RMG
#Integration-Server-and-ESB#Flow-and-Java-services#webMethods