Sounds like the file system may have gone into read-only mode so the system cannot write logs. An easy way to check this is to look at the time the syslog stopped writing and check the last CCM trace file, if they both stopped at the same time chances are high you're in a read-only state. It would be best to open a case with us and we can take a look at your server to see if you're running into a known issue.
