Did you try to center the switch? Evidently it can come off-centered causing issues like the one you’re experiencing. It’s covered in this thread. This is the fix per post #518.
————— snipped from post #518 ————————
T18
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OK, fixed my switch issue.
What was happening was the switch boot nub was catching on that flat ledge around the switch contact pad.
So all you have to do is remove the switch boot, very easy to do.
Check the switch by directly pressing on the switch contact and go through all your modes and on/off, check double click, check everything and if all your modes are working fine then it’s probably not centered and catching on that ledge, you should be able to notice easy enough.
So being that the driver, switch and MCPCB are all one piece, just get some very fine tweezers and inside the positive end of the driver take the tweezers like you where going to remove a regular retainer ring, and just slightly turn the complete driver assembly one way or the other until it looks centered and put the boot back in, it’s very easy to put in since that retainer isn’t really pressed down hard onto the lip of the boot.
And done,
Hope that helps someone, these are really great lights no matter what.
Thank You George, what’s next ??
Edit: By the way the reflector is threaded and mine had a small dap of glue on it, might be wise to remove reflector prior to twisting on the driver end…