Don't suppose you're using syslog, otherwise you probably wouldn't be asking. If you had a syslog server, that would tell you what was going on before the "crash".
3600s are notorious for doing this sort of thing. Have you tried simply powering it off for a while to try to get it to come back up?
Usually when a router goes into ROMMON, it's because it doesn't not find software image, the config is corrupt, or config register is set to make it do so. You can load images and configs from rommon, just use ? to view available commands.
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