What did your NEX do exactly?
You may have a look on this thread :
https://www.candlepowerforums.com/threads/229918
As mine is brandnew, I will return it immediately. Sometimes it just quits working when switching on high, sometimes it flickers. I cleaned everything several times, same result.
I am not sure if the problem really is an electronic one, I realized that the whole thing where the battery makes contact in the heads can be pressed down and that it turns. When I turn it with a plier a quarter of a tour, the light may work normally 10 to 20 times until it begins to flicker again. There may be a bad contact somewhere inside the head, I suppose that whole thing turns when you change modes.
I like the light though, I hope I can get the same back, GDP and ss bezel! :candle: