Update 01.06.2015: Issue still remains. The suggested fix in this post didn’t work for me.
I have a dedicated Linux server (Debian) that runs Piwik. It’s a fairly standard installation of the LAMP stack. My Piwik server tracks visitors on 5–6 websites and one of them is fairly large with thousands of visitors per day. In recent weeks, my Piwik server would sometimes just hang. Responses weren’t sent and thus, I have gaps in my visitors graph, which is pretty annoying.
Continue reading Server Hangs or Crashes with large Piwik Installation