Weird IP address value in apache log

Solution 1:

The abortive shutdown messages just mean that the SSL sessions didn't terminate via the normal process - so a malformed client, or a robot, etc could just be abandoning connections. It's typically indicative of a client issue of some sort. Unless there are a ton of them, and users reporting issues, it's probably not your cause.

For further troubleshooting...

What does dmesg say around the time of the crashes?

Is there a pattern at all to the crashes?

Any cron jobs running?

What do system resources look like before you restart the failed Apache service?

Have you set the logs to full debug to see what it says?