Unable to access host via HTTP
I'm currently having an issue with my Mac OS X server running Yosemite 10.10.4. Every 15 minutes or so, Apache stops responding, although it's still running. I have to SSH into the server, and as soon as I do that Apache starts responding again. It's very odd behavior, and not something I know how to fix, as I'm not a qualified administrator, this is just a home server that I host a few applications on. This started happening after a recent update a few days ago. Any help is greatly appreciated!
Mac mini (Late 2012), OS X Yosemite (10.10.4), Server