need to be restarted

About every 10 days I'll go to visit my website and it will be down. I then log into Linode and on the dashboard see that Apache needs to be restarted, after which everything is fine. What's the best way to figure out why this is happening?

A couple of months ago there were specific error messages, but lately there's no indication as to what happened, at least not where I'm looking…

Also, I took some screenshots-- can I upload images on this forum? I see the Img button but I guess I don't understand how that works.