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amey-
Lens locking cap is lefthand thread if you want to open it up to dry it out (i.e. screw clockwise to remove). Lens cap then just lifts off. I reassembled with plumbers PTFE tape on the lens locking caps threads to play it safe (no idea if moisture got in that way though). I noticed some condensation on the inside about the same time the light began to not let me turn it off whilst in-motion (was perfectly fine for the 6 months prior). Seems like a bit of a questionable build quality on the B&M IQ-X.
Alb
Check the connections, then put it in a bag of rice.