I'd encourage the clicky as well. If you can find it, try it out and see what happens when you move your hands to engage/disengage the light.

Let me state that my light isn't the M3, it's an older C3, so this may not apply to this discussion, but I'll put it here to answer the question... My light changes modes as you move the light into various positions. If it's flat, it stays, but if you 'tilt' it forward/backward, it can change modes or even turn on/off. Seems to be the 'brain unit' that's jacked up, or possibly something in the battery/power. I'm sure we'll get it worked out.

I must say the M3 with 1K lumen is very tempting!!