Where to begin troubleshooting?

I am running Asterisk on Asus RT-N16 and it works well, however, sometimes, I find that the service goes down. This means in have to invoke:

I would like to understand why the service stops (seemingly at random) and would appreciate any specific and actionable guidance. I think that the logs are a good place to start, however, I am not sure I would recognize the issue in the log were it to present. Thank you.

wiki.asterisk.org/wiki/display/ … +Backtrace (ignore any JIRA pop-up).