I had the situation where whenever I turned off the monitor and later turned it back on. MM would load a second instance of the server. Took me a while to figure out that it was the HDMI port that was the culprit. I was using a 32 inch Vizio TV and HDMI2. In trying to figure out why this was happening I tried another monitor and it worked correctly when turned on and off. So FYI it may be that the HDMI port that you are using is sending a signal to the MM software to reload the server when it is turned on again.

For clarification I am NOT turning off/on the server just the display.

Hope this helps someone else