There will be situation that DCLog Core Recording Engine is running and there is no recording. This might due to the connection between Synway card and the software has been interrupted.
If you found the recording core service (DCLogShrec) is up and running, and the dclogshrec log contain error "SH_CallBack ()", please navigate to the directory below to check on the Synway Card log.
/usr/local/lib/shcti/ver5.4.42/tools/ShCtiLog/ShCtiSystemInfoLog
Within the log, look for below error.
[15:00:58:447] Board Id 0 was Lost Interrupt! Board Id 0 was Lost Interrupt!
This error can be temporary prevented by reboot the server, ribbon cable replacement are recommended to resolve this issue.