zend_mm_heap corrupted

After making a fresh installation of Omeka 2.3, I have been having random 500 error messages showing whenever I tried to do an action from the dashboard (configure a theme or a simple page, for instance). I contacted the server administrator who told me there are
"zend_mm_heap corrupted" errors which prevent it from running smoothly and also that my instance is reaching the maximum available PHP processes frequently. Why is that? I have just installed it and there is no traffic there but me, trying to sort it out. How do I fix this?