2016-09-12 09:00:01 PDT LOG: server process (PID 23958) was terminated by signal 9: Killed
2016-09-12 10:00:01 PDT LOG: server process (PID 30766) was terminated by signal 9: Killed
2016-09-12 15:00:01 PDT LOG: server process (PID 22030) was terminated by signal 9: Killed
These datetimes could be suspect. Every crash (kill) is done at "00"minutes and "01" minutes, that makes me ask "Isn't there something like cron running something that interfere with postgres?"