I have noticed that my production box (B+) was constantly toggling MLAT on/off. My Pi2 with nearly identical config/setup had MLAT on almost always. I swapped my B+ box for another Pi2 and it appears that it is no longer toggling. Going to monitor it for a while and report back the long term results. You can see it in the graphs below and see where it was toggling on the B+ and is consistently on now that it’s on the Pi2.