My Eagtac G25C2 MKII smells funny when I took of the head (which you turn to adjust). It seemed looser than normally. Upon closer inspection, the threads were covered with fine grey powder that painted my fingers and the things smelled smoky. I didn't use the light for a few days so whatever this is it did not just happen. I didn't notice anything unusualy lately either. I used it in the woods, 2000m+ altitude, also took it on a few flights in the last couple of weeks (in carry-on). The Keepower battery was sometimes taken out but I also flown with it left inside the light. What is this, is it normal?